Originally Posted by Seamaiden
Oh my goodness, you folks prefer to treat the display??? 8O
Of course not! We prefer to never have sick fish in the first place.
I have 31 tetras, 6 cories, and 5 kuhlies in my biggest tank, plus I dont know how many otos (8?) and over a dozen shrimp. If one fish gets sick, I probably won't see it until things are pretty bad, and if whatever it is is contageous, then the whole tank will probably have it. Even if I knew one of the fish had a problem, I'm not sure I could catch it even if I did notice it. Heck, all the cardinals look alike and there's 25 of them. I doubt I could catch a kuhlie loach in a planted tank, sick or not. Three of the five that are in there were moved from the 20 gallon after I had taken out all of the plants and a lot of the gravel, sly little guys.
Really, the source of the illness is important. One fish may be ill from a mechanical injury, or getting bitten or something, or the whole tank may be stressed by something and only one is ill but the rest are pretty near it. So, the tank might actually need treatment.
So, for me, netting out a sick fish or 5 is not all that likely to happen in that tank. And 5 or a few more is all I could hold in the 10 gallon barebottomed Q tank anyhow.
My Q tank is much more often used for quarantine for new fish than it is used for sick fish. Personally, I've never had to treat a big planted tank for anything yet.