I have owned tanks for a minute now and have never dealt with inch of any kind, I recently received some fish from a local hobbyist that was getting out of the hobby which I think to be the culprits. The question is this the start of ich? As of rn he’s the only one with the white dots, my blue hippie nor any of the others have it besides this orange fish (no white dots) just having an odd mass on one of his fins. If so how do I go about starting to treat this? What about corals and anemones can they host the disease also? Can I medicate the main tank as of which they are all in and just take care of it that way or will that harm corals? Just need a simple run down as I have other tanks I can move them too (none have water nor have not been cycled, how do I get around this?) just worried about the main.