For me I started out still and still am at the moment but learned so much about it since i had a year.Any ways I finally got my first cat fish(sort of)Clown loaches since I know that they are pretty much the same as cat fish but when I saw them in bag they were in excellent condition but after I put them in tank I saw ICH 
but my parameters were fine*note* i bought 2 One of them I put in a third stocked 75 freshwater community fish tank(thank god I caught it in time ) and the other in a 10gal. to help clear out some pesky snails but the 10 was used as a temp hospital tank but the ich that was in there was long gone but since the one in the 75 had ich it couldn't be from past disease but I did my research on cats or scaleless fish and found the easily sickened by diseases and from past ich problems its from temp change(wrong) or stress my best guess was from stress from the fish person trying to catch 2 from a group of 35 i think but i acclimated them.So this thread is to tell you something weird and you can post ure funny stories of ich or other diseases!and it was a hell of a time catching them I was going nuts just trying to find the one in 75
!
but my parameters were fine*note* i bought 2 One of them I put in a third stocked 75 freshwater community fish tank(thank god I caught it in time ) and the other in a 10gal. to help clear out some pesky snails but the 10 was used as a temp hospital tank but the ich that was in there was long gone but since the one in the 75 had ich it couldn't be from past disease but I did my research on cats or scaleless fish and found the easily sickened by diseases and from past ich problems its from temp change(wrong) or stress my best guess was from stress from the fish person trying to catch 2 from a group of 35 i think but i acclimated them.So this thread is to tell you something weird and you can post ure funny stories of ich or other diseases!and it was a hell of a time catching them I was going nuts just trying to find the one in 75!