There are really only two options.
Hypo and/or treating with medication.
*In my opinion* Hyposalinity can be really tough to maintain, I know because I did it for over 4 weeks when I had an outbreak and ended up ultimately going the med route.
Not all fish can tolerate medication so that would definitely be something to research depending on your livestock.
I believe both hypo and meds can be
hard on a fish. Especially a sick fish. Hypo can take weeks to work and prove stressful for the fish and the aquarist. Copper must also be done correctly or it can be ineffective or fatal! (Lol damn this doesn't sound very comforting)
Hypo for 6-8 weeks can be very difficult. You need to really maintain the low level salinity when doing hypo-salinity. when evaporation occurs and your salt levels increase the ick still survives and you can start all over again and again. I would only suggest doing hypo if you plan on having a large 30+ gallon tank (larger the better) with a controller, Ato setup, and a good
refractometer. With the time to maintain and Test daily.
Some other things you would also need are a lot of hiding places by using PVC or something else. Ick infested fish will already be stressed, an air stone is also advised along with constant daily water changes. I would also have a bottle of amquel on hand to battle any surprise ammonia spikes.
If you try hypo with a small tank it's going to be very very difficult. A 20 drove me nuts.
when things didn't seem to improve and maintenance was difficult I chose the medication route.
Also feed a good varied diet with garlic.
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