fast

.. Side effects of whatever are :... Lethargy, haven't eaten in a week, I see no poop,.. Itching, trashing off decorations, shaking Fins off, darting, laying at the bottom, heavy breathing, no spots, just looks like gray matter or something on there skin... Idk what to do but I know this...

I have brought 4 Tiger Oscars from a local fish store.I keep them in a 300 Gallons tank with 2 Cat fishes,1 Giant Gourami and 1 Snakehead fish.I want to grow my Oscars upto maximum size they grow and I want MFK's help to grow them fast and maximum.