What's wrong with my pygmy Cory?
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Old 04-01-2013, 03:10 AM   #1
AirstoND
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What's wrong with my pygmy Cory?


Is it oxygen deprivation?

I did put it in a 3gal playsand tank for breeding. The tank was cycled with tank water and start zyme for about 3 weeks. It also has a heater 75F and airstone at full blast. The other male and female in breeder tank are OK.
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Old 04-01-2013, 06:01 AM   #2
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Cycled with tank water?
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Old 04-01-2013, 06:46 AM   #3
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Default Re: What's wrong with my pygmy Cory?

If BB has nothing to eat for 3 weeks...
Check your water.
Add some drops of Prime and StressZime just in case

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Old 04-01-2013, 10:14 AM   #4
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it looks like this fellow has suffered some sort of shock. pygmaes are pretty sensative cories so its likely environmental. What's the TDS in the tank? Bear in mind they come from acidic waters and many parts of NJ are known to have extremely hard water... it may be worth checking the ph/gh/kh
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Old 04-01-2013, 08:09 PM   #5
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Quote:
Originally Posted by acitydweller View Post
it looks like this fellow has suffered some sort of shock. pygmaes are pretty sensative cories so its likely environmental. What's the TDS in the tank? Bear in mind they come from acidic waters and many parts of NJ are known to have extremely hard water... it may be worth checking the ph/gh/kh
Oooh yes! Since my tanks have been setup, I am now consistently at just below 7.0 ph pretty consistently. I recently purchased fish and they croaked on me. Went back to buy more, but this time I asked what the ph of their tanks was. 7.6! I acclimated fish for close to 7 hours before putting them in my tank. Did this twice since then and all has been good.

And you can't cycle a tank with tank water. You need to use filter media to accomplish that feat. AND you should still acclimate your fish even if you are just moving from tank to tank. Unfortunately, my tanks' parameters are different from one another. But that's because they are different sizes and have different maintenance schedules. You should always check before moving.
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Old 04-03-2013, 08:12 PM   #6
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Cycled with tank water?
Works OK. Bit slower than substrate or filter matrix but works never the less.

Besides, three pygmys would have to generate 3ml of pure ammonia to reach about .1ppm. That's a lot for three little fish. They would be lucky to have that much blood between them!

Established matrix would nearly all die from lack of food so what ever was in the column would handle it.
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Old 04-03-2013, 08:16 PM   #7
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That's not a pygmy cory, it's a Corydoras habrosus.
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Old 04-03-2013, 08:27 PM   #8
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It's not that it's slower - there's no real beneficial bacteria in the tank water. The bacteria that process ammonia grow on surfaces. One would get just as much bacteria into their tank using old tank water as they would using freshly treated tap water.

Three Corydoras habrosus definitely produce enough ammonia to cause a nasty spike in three gallons of water. (Further, 0.5ml of a 10% ammonia solution that's commonly available in the US would be more than 0.1ppm. 3ml of 100% pure ammonia would be waaay more than 0.1ppm.)

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Works OK. Bit slower than substrate or filter matrix but works never the less.

Besides, three pygmys would have to generate 3ml of pure ammonia to reach about .1ppm. That's a lot for three little fish. They would be lucky to have that much blood between them!

Established matrix would nearly all die from lack of food so what ever was in the column would handle it.
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Old 04-03-2013, 08:45 PM   #9
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Well, what's the pH? Because if it's 7.0 or less, almost all Ammonia will be Ammonium, which is less toxic.
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Old 04-03-2013, 08:57 PM   #10
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Well, what's the pH? Because if it's 7.0 or less, almost all Ammonia will be Ammonium, which is less toxic.
Sorry, what happend to ammonia?

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Old 04-03-2013, 09:37 PM   #11
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Quote:
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Sorry, what happend to ammonia?

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NH3(aq) + H+(aq) <--> NH4+(aq)

Keq for this equation is 1.8 x 10^-5 at 25 deg C, meaning that there is almost 20000 times as much Ammonium (NH4+) as Ammonia (NH3) in a neutral solution. This is why the API tests aren't very useful.
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Old 04-04-2013, 04:00 AM   #12
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It's not that it's slower - there's no real beneficial bacteria in the tank water.
There aren't many, but there are always some. They are ubiquitous in the environment, so they eventually end up in the tank. We just concluded some experiments on this and found the mean difference was about twice as fast as with treated tap water alone although it depended on humidity and other factors. Just to complicate matters there appears to be several types of Nitrifying organisms including archaea. Unless you do PCR it's hard tell how many or what types you get. Depends on where you are in the world as well.

We were even surprised to find Ureolytic Bacteria had built a massive colony in one test tank in just 12 weeks.



Brain fade!
Yes I was wrong about ammonia math. Four in the morning brain was tripped over between mg/L and ml/L. They would need to produce about 24mg to get noticed in 12 L assuming half is NH4. Although still seems a lot to get to before a water change from three pygmies.
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Old 04-04-2013, 11:55 AM   #13
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Hence: "One would get just as much bacteria into their tank using old tank water as they would using freshly treated tap water."

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There aren't many, but there are always some.
But back to the OP: Beyond parameters, have you stirred anything up in the tank? Used anything in the tank that could have had medication on it?
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Old 04-05-2013, 12:51 AM   #14
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Hence: "One would get just as much bacteria into their tank using old tank water as they would using freshly treated tap water."



But back to the OP: Beyond parameters, have you stirred anything up in the tank? Used anything in the tank that could have had medication on it?

Moved back to larger tank..still alive
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Old 04-05-2013, 02:35 PM   #15
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Moved back to larger tank..still alive
Course it would be or at least the 'cycleing' had nothing to do with it.

It would takes ages for unionised ammonia to build up to toxic levels in a 12 litre tank of three weeks + additives with three pygmies.

Worst case high protein diet active metabolism...

NER = 5mg TAN per 100grams of fish per 6 hours

1 gram fish NER = .05mg TAN

12 litre tank = .004mg/L

ph 7.5 @ 25C conversion = 0.000071ppm NH3
ph 7.0 @ 25C conversion = 0.000023ppm NH3

The NER would likely be 3 for a small cory, even less for a quiet unfed one.

Thus if there are only 3 small fish and no other excretora in the 3 week old tank you would be unlikely to ever see unionised ammonia.
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