It's not about the fish's health or welfare---though it's certainly easier to treat and save him if you have him in a bare glass tank that can be treated.
No. It's about that tank you just sweated bullets and nursed to life. If you put a parasite-infested fish into that new tank, the only way to get the parasites out is to have that tank fishless for 12 weeks. Otherwise you will have endless grief and sick fish.
There are parasites, like ich and flukes, that can hide in gills. Ich lives in the sandbed and in fish. It's terribly common.
There are diseases and viruses that produce films on the fish's skin or affect the fish in other ways, and most of these can prove fatal if not treated appropriately.
Treating a 'well' fish 'just in case' is not such a good idea. Parasites take one kind of treatment; bacterial infections require something else---and if you picked the wrong one, you're going to have put the fish through two stressful treatments, when sometimes the fish's window for good recovery is hours, not weeks.
If you are forced to treat---do not use carbon; it absorbs meds; do not use a filter that has a black (carbon) side; and do not have rock or sand in the qt. Rock and sand harbor ich parasite, and the bio load if your treatment kills the bacterial sand and rock --- as it well may--- is not going to help the fish at all.
No. It's about that tank you just sweated bullets and nursed to life. If you put a parasite-infested fish into that new tank, the only way to get the parasites out is to have that tank fishless for 12 weeks. Otherwise you will have endless grief and sick fish.
There are parasites, like ich and flukes, that can hide in gills. Ich lives in the sandbed and in fish. It's terribly common.
There are diseases and viruses that produce films on the fish's skin or affect the fish in other ways, and most of these can prove fatal if not treated appropriately.
Treating a 'well' fish 'just in case' is not such a good idea. Parasites take one kind of treatment; bacterial infections require something else---and if you picked the wrong one, you're going to have put the fish through two stressful treatments, when sometimes the fish's window for good recovery is hours, not weeks.
If you are forced to treat---do not use carbon; it absorbs meds; do not use a filter that has a black (carbon) side; and do not have rock or sand in the qt. Rock and sand harbor ich parasite, and the bio load if your treatment kills the bacterial sand and rock --- as it well may--- is not going to help the fish at all.