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I did the " plop and drop" acclimation method - it worked fine. Fingers crossed!
Hi @miktrebor

I have some difficulty accepting this term "plop and drop acclimation". To me, it's a contradiction in terms. There is no acclimation (or acclimatization as we would say in Old Blighty). So, this approach seems wrong to me. Otos are tiny fish whose osmoregulatory system must surely be tested to the limit when transferred instantly from one set of water parameters to another. It's not just electrolyte balance but pH, temperature, etc. Unfortunately, I can't provide any evidence to prove that this method is flawed. If this method has the potential to stress fish, then perhaps this will make the fish more susceptible to infection?

Anon
 
So a I have an Oto related question, hoping someone may have an answer here. I originally got 4, one died. then plans changed so I bought 6 more, one of those died. No other deaths.

The issue... The original 3/4 just chilled wherever in the tank and grazed happily. They all did this when I got the 6 new ones as well. After about a week, maybe 5 days at the shortest, they all huddle together now in one corner behind the canister output where I also have bamboo and pothos stems. I rarely will see one of what I think is the originals out and about. But that's it. they have now stayed behind the output for about 4-5 days now. I did a water change and tested it, it's fine. This seems more behavior related and I don't check but maybe once or twice when it's dark. I don't see them in the main tank(They are up behind the output). It's a 33L and there are 8 of them, they should be obvious if they are out at night. they don't seem to be.

Anyway, thought it would subside after the water change, I was busy and had to put it off a little longer than I thought so I figured that was it. just beginning to worry about their health now.


Off side thought/question, I'm pretty sure there are at least two different types of Otos within each group. or are they just male/female. Some are lighter in color with more of a pattern while the others are dark and less pattern, just darker. These darker ones also seem slightly smaller.
 
So a I have an Oto related question, hoping someone may have an answer here. I originally got 4, one died. then plans changed so I bought 6 more, one of those died. No other deaths.

The issue... The original 3/4 just chilled wherever in the tank and grazed happily. They all did this when I got the 6 new ones as well. After about a week, maybe 5 days at the shortest, they all huddle together now in one corner behind the canister output where I also have bamboo and pothos stems. I rarely will see one of what I think is the originals out and about. But that's it. they have now stayed behind the output for about 4-5 days now. I did a water change and tested it, it's fine. This seems more behavior related and I don't check but maybe once or twice when it's dark. I don't see them in the main tank(They are up behind the output). It's a 33L and there are 8 of them, they should be obvious if they are out at night. they don't seem to be.

Anyway, thought it would subside after the water change, I was busy and had to put it off a little longer than I thought so I figured that was it. just beginning to worry about their health now.


Off side thought/question, I'm pretty sure there are at least two different types of Otos within each group. or are they just male/female. Some are lighter in color with more of a pattern while the others are dark and less pattern, just darker. These darker ones also seem slightly smaller.
Whoa! Maybe this is a seasonal thing, my Otos started hiding about 2 weeks ago. Clustered together in a corner.

Before I read this I was going to post if anyone had experience with them being sensitive to bug spray. I have gnats in my pots in the same room I'm growing seedlings.

Interesting, same behavior....
 
Whoa! Maybe this is a seasonal thing, my Otos started hiding about 2 weeks ago. Clustered together in a corner.

Before I read this I was going to post if anyone had experience with them being sensitive to bug spray. I have gnats in my pots in the same room I'm growing seedlings.

Interesting, same behavior....
crazy!

last night I checked again about 20 minutes after lights out. There were 3 or 4 out from behind the output. But they were only about 6 inches from the output. It's been about a week now. They are in a Gourami tank but they ignore these Otos all together.... I haven't seen one even take a second look at them. Hell, I haven't even seen one take a first look....
 
Are you sure its not a dissolved oxygen (DO) water issue? I don't have any personal experience with the fish (looking to maybe get a group soon) but from what I read they come from slow to medium flowing streams and rivers that are highly oxygenated. At night plants consume oxygen and given that the fish hover near the output of the filter at night it leads me to think you have a DO issue. The air pump helps break the surface to allow some Co2 escape but it is likely not enough and your fish might be dying of asphyxiation. Just an idea to investigate.
 
Are you sure its not a dissolved oxygen (DO) water issue? I don't have any personal experience with the fish (looking to maybe get a group soon) but from what I read they come from slow to medium flowing streams and rivers that are highly oxygenated. At night plants consume oxygen and given that the fish hover near the output of the filter at night it leads me to think you have a DO issue. The air pump helps break the surface to allow some Co2 escape but it is likely not enough and your fish might be dying of asphyxiation. Just an idea to investigate.
I run air starting 1 hour after CO2 turns off so about 8pm. Air turns off 1 hour before CO2 turns on. They are actually hanging out under my CO2 diffuser...
 
Are you sure its not a dissolved oxygen (DO) water issue? I don't have any personal experience with the fish (looking to maybe get a group soon) but from what I read they come from slow to medium flowing streams and rivers that are highly oxygenated. At night plants consume oxygen and given that the fish hover near the output of the filter at night it leads me to think you have a DO issue. The air pump helps break the surface to allow some Co2 escape but it is likely not enough and your fish might be dying of asphyxiation. Just an idea to investigate.
I have an air stone that runs 24/7 at the opposite end. I have the output set up to cause surface disturbance on one end and the air does it on the other end. So I also don't think it's the air that's an issue.

@dawktah2 I checked again last night. They seem to be coming out a little but again I only see a few at a time and no more than about 8 inches from the corner. they seem a little skittish but I am shining a light at them when it was pitch black the instant before. so makes sense there.
 
I did another water change. The only other thing that is new is I am using Seachem Alkalinity and Acid Buffer. I am going to stop using this and switch to Salty Shrimp Shrimp Mineral GH/KH. I am going to do anther water change Monday using no Seachem products.
 
Otos still clustered in the corner and algae is growing on Anubias. So how long can one of these fish go without eating? Can't tell if they are sick or what's going on.
Mine haven't come back either. I haven't lost any. When I did a water change they all came out. pretty sure this was cause the filter was off. also a canister filter. I took this opportunity and pulled the 8, split them into 4's and now they are in two groups in my 10 gallon play tanks. they seem mostly nocturnal now, even though the first three were happily out and about all day. I don't see a lot of feeding from any of them but none are skinny either though. I have read these are difficult fish, I never understood how. This must be part of it. I read somewhere they were hard to please or something. picky with parameters? I don't recall.

I will say they seem a little better in these 10 gallon tanks which only have sponge filters. So Maybe it has something to do with the flow?
 
Mine haven't come back either. I haven't lost any. When I did a water change they all came out. pretty sure this was cause the filter was off. also a canister filter. I took this opportunity and pulled the 8, split them into 4's and now they are in two groups in my 10 gallon play tanks. they seem mostly nocturnal now, even though the first three were happily out and about all day. I don't see a lot of feeding from any of them but none are skinny either though. I have read these are difficult fish, I never understood how. This must be part of it. I read somewhere they were hard to please or something. picky with parameters? I don't recall.

I will say they seem a little better in these 10 gallon tanks which only have sponge filters. So Maybe it has something to do with the flow?
@Aaronious I think you may be right. I wonder, how long can a canister filter be off before bacteria die due to lack of oxygen? Maybe, try filter hour on, hour off?

This article is inconclusive but seems to imply starting hour on/off could give an idea if this is the cause?

They're a river fish so flow should be something they are used to. I'm going to buy another three fish. See what happens.

.

.
 

Attachments

Hello @Aaronious and @miktrebor I bought 3 new Otocinclus, two of the three didn't care about the flow, one was stationary until I turned canister off.

This one locked in and didn't move until filter was off.
View attachment 1027642


This one started clearing leaf off...didn't care.
View attachment 1027643

So too high of flow may have something to do with behavior but is not the only factor. Will be buying a timer tomorrow to turn canister to a on/off program with always on when lights are off
 
Hello @Aaronious and @miktrebor I bought 3 new Otocinclus, two of the three didn't care about the flow, one was stationary until I turned canister off.

This one locked in and didn't move until filter was off.
View attachment 1027642


This one started clearing leaf off...didn't care.
View attachment 1027643

So too high of flow may have something to do with behavior but is not the only factor. Will be buying a timer tomorrow to turn canister to a on/off program with always on when lights are off
I still have my 8 split in two 10 gallons. They seem pretty happy these days. In these tanks are all new fish that are quarantining sort of. As I have never had a problem from this LFS. but they are all about the same size, I think this has calmed the Otos a good amount.
 
I have placed canister on a timer so its off 30 minutes evenly spaced overnight and on 30 minutes off an hour evenly spaced during the day. If the Otos come out and start behaving more normally I will report back. Otherwise, will just continue this topic on my journal.

No change

Thanks for everyone's help
 
Two pieces of advice that I have not seen mentioned:

1) If at all possible purchase otto that have been sitting at the store for a couple of weeks or longer. That way the weak ones are not for sale by the time you purchase them.

2) Never put them in a new tank - always put them in a well established tank that is well decorated with wood and plants. The reason for this isn't just the obvious of swing in water chemistry and an established cycle but otto also feed heavily off of biofilm and that takes a while to build up.
 
Can't emphasize the mature tank enough!! A lot of oto won't take algae wafers, period. They will starve to death before taking wafers. Not all are like this but I'd say a good 60% of the otos I've dealt with are like this. Actively feeding them blanched veggies may work for most of them, but I've come acrossed a few that require aufwuchs, they have refused everything but aufwuchs and biofilm.
 
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