How do you treat tanks after disease?

In a moment of not thinking straight I must have spread some nasty disease through all of my five tanks. I think the disease came with some cherry barbs I bought (most of them died), and I might have spread it with a water glass I used for filling up HOBs after cleaning them :wall:.

Anyway, now I lost all of my pristella tetras, serpae tetras, my dwarf puffer, and it seems I'll be without guppies for the first time, too. My catfish or my glowlight tetras were fortunately not affected.

Now, what to do with the tanks? It seems awkward to try and treat all of them with antibiotics. With some tanks I don't like to try any harsh measures, because of the plants and the inverts in there.

What would you do?

msjinkzd said:

the inverts and plants won't perpetuate the disease most likely. Wait a month until you add new fish to those tanks, and ideally qt any new fish (and have the qt have its own set of equipment) for a month of health.

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Yes, that was really stupid of me to use the same glass in all tanks. As I have two empty tanks now, I have no worries about what to use as quarantine tank.

jm1212 said:

i would do a mass QT of all of your tanks until the disease burns out. hopefully your remaining fish wont get infected and you wont have to start completely over.

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I hope that, too.

What do you mean with mass quarantine? It's clear that I won't move any fish, at least as long as the disease doesn't spread to the remaining species.