The reason to use a QT! - The Planted Tank Forum
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post #1 of 4 (permalink) Old 08-19-2017, 06:08 PM Thread Starter
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The reason to use a QT!

Two weeks ago, I bought 50 Neon tetras from Petco ($1/ea). Within the first 48 hours, ten of them passed, but the other have colored up, are schooling, and eating like miniature pirannhas. There was even a mass spawning in the first week.

One of the larger Neons had its tail bitten off (probably by Serpae tetra in store tank), and I've been watching it grow back. Over two weeks, the tail went from nothing to about half sized.

Because I was watching this fish so closely, yesterday I noticed a small white fleck on its side. There was also one other fish with a white spec on its tail. I began treating for Ick. This morning I don't see any specs on fish, which means they probably are in the free swimming state, or it was just a random grain of sand or something else stuck to it. Hopefully I can nip this in the bud with ick meds and daily water changes.

Also just to be sure, I am using API General Cure to handle any unseen parasites. I realize I have no idea where these fish have been.
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post #2 of 4 (permalink) Old 08-19-2017, 06:59 PM
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Not only that but the amount of fish that come into a fish store. Unless the tanks are drained and dried regularly(which is too much to do for any fish store), usually the parasites go on to the next batch of fish and so on (IMO). Even if the fish aren't showing signs of disease they can still be carrying it. Added my last fish to a fully stock reef and it ended up having velvet or ick and wiping out the whole tank.
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post #3 of 4 (permalink) Old 08-19-2017, 07:37 PM Thread Starter
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Originally Posted by Bleuwater View Post
Not only that but the amount of fish that come into a fish store. Unless the tanks are drained and dried regularly(which is too much to do for any fish store), usually the parasites go on to the next batch of fish and so on (IMO). Even if the fish aren't showing signs of disease they can still be carrying it. Added my last fish to a fully stock reef and it ended up having velvet or ick and wiping out the whole tank.
These 40 Neons don't seem overcrowded in their 10g QT. I'll probably keep them in there 1-2 months, no need to add them now.

Also, it makes me wonder when I see the new trend on YouTube fish channels, of guys adding 300 fish at once to their MT. I'm sure it gets clicks, but not sure how good it is to do that.
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post #4 of 4 (permalink) Old 08-19-2017, 09:11 PM
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The only times I've added new purchases to my main tank, the main tank was completely unpopulated, or at least, not populated with anything important. And it's not just the regular parasites, there's worming and quite likely, internal bacterial infections, particularly for bottom feeders and carnivores which often feed on dead tankmates (actually, I watched a walmart employee netting out dead guppies and feeding them to the oscars once).

I've gotten to where I assume a fish is sick and treat it for whatever its species is most likely to have - livebearers and tetras get treated for columnaris, livebearers also get wormed. Angels get wormed and treated for hex. Easier to fix it when fish aren't symptomatic than when they're dropping like flies and you need the meds yesterday.

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