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#1
04-05-2012, 08:40 PM
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This could be short sighted and way off but if you are QT'ing a fish and and shows no signs of illness or if you just treat with something broad spectrum why would you need to change water. Wouldn't you be killing what ever the broad spectrum treatment covers and if the fish did develop something that wasn't covered you would treat for it until it clears...That being said I never have had a QT tank so......
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#2
04-05-2012, 08:45 PM
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My treatment tank is about 25g, so for the best start, I'd use new water. I've never used a treatment tank before, but I now put the fish in, treat with a standard dose of CP for a couple weeks, and transfer fish to DT. I would then empty it, give it a wipe with a towel, and leave it until I get another fish. Repeat. I don't want to maintain a running tank as a q tank, as I don't regularly purchase fish. Since I treat for ich/velvet/brook regardless, I'm not worried about spores.
Bringing a new fish in, I want the cleanest water to start. If you Q fish and don't treat, I assume there are no cysts to worry about. If you previously treated with copper, then you either mix dosages going forward, or you use carbon to remove it. Waste of perfectly good carbon  Ultimately a personal choice, but for me, I'll just make clean water.
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Brad
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#3
04-05-2012, 10:57 PM
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Quote:
Then there are nasty stuff that are not bacterial, like parasites, virus, and such that don't react to antibiotics. You need some other medicines for them. For some parasites, when they are in cyst stage, no known medicine can kill them (at least no medicine that you and I can get our hands on). And the cysts can survie some extreme condidion like high temp and very low salinity. It's a good practice to clean your QT tanks and change all water after one round of QT.
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