Ok heres the deal. I recently noticed what looked like ich spots on my silver dollars (3) in my 90 gal. They dissapeared after 2 days and have not returned. My oscar (7-9") has been acting irradic as well. my 5-7" clown knife and bristlenose pleco have acted entirely normal during all of this. I have an Emperor 400 bio-wheel filter and a Fluval 405 canister on the tank. Whats going on?