i bought a goldflake angel a few days ago that has been in the fish store for more than a month( i literally waited for several weeks to make sure he's gonna live), very active and eats like a pig with no signs of ick at the fish store, but today when i got home i noticed some ick on the fins so am really worried right now, he's still active and eats pretty much anything (even formula 1 & 2 pellets, brine, mysis,krill,marine cuisine etc) i try to feed him often whenever i can to boost his immune system. i was thingking of treating him before in a separate tank but i only have a 10 gallon tank that has water and ready to go. what do you guys think should i do?