WELCOME TO AA!!!
sound like a good idea, or should i wait a bit longer to confirm he has ick?
It sounds like you have done your homework. If you can set up a QT, I would do it ASAP. Ick, will host a fish then drop off and reproduce, and reinfect them, then reproduce and so on.
A QT is very simple. You will need lights, heater, filter, PVC
and a refractometer, to easily and accurately measure the SG
of the water.
Since the fish are stressed, and water quality is very important, you will, most likely do more water changes, especially if you are doing hypo treatment. If you have a filter with bio balls/wheel or carbon and have decided to use medication, it is best to remove the ball/wheels and carbon. You don't want and sand or LR
in the tank.
I'm not sure about the size of tank, I would imagine it depends on how big your fish are. I believe I have read a 30G is a decent size.
I haven't had ick, so I am not too sure which method you would use. If it were me, I would go with the hypo, but that is just my opinion. I have read other have had success with both.
I would wait for more opinions and experience, before making your final decision.
Also, I soak my food in selcon, zoe and garlic. The garlic is said to boost the immune system and get finicky eaters to feed. The other two are vitamins and such.