My red bellied pacu (Marlon) has noticable ick. I have since removed him from my 75 gallon tank to a smaller 20 gallon tank.. he is alone.. I have raised the temp gradually and added salt.. 1st 1 tablespoon per 5 gallons today I increased it another 1tablespoon per 5 gallons. I am using sea salt. I did however go to the pet store and purchase Wardleys ick out sensative. I am not sure how I should treat the tank he came out of , which houses 2 Oscars, a clown knife a small red devil and pleco. i also have 4 other tanks that i have been using the same nets and siphon in... what should I do to maintain the health of the other fish... Should I even use these drops? I am hearing horror stories... its a fairly large whit fuzzy patch on his side