I recently had an outbreak of marine velvet and brook. I put all my fish in quarantine and running a cupermine treatment. I still have corals in the display tank. Finger leather, 2 leather polys, rock flower anemone, a mini carpet and a condy. All my fish are in quarantine tank so I have nothing in there to keep the ecosystem in check. Now I am getting brown diatom Althea in the display tank. I do have another salt tank that is doing wonderful and has had no issues. I can’t put any corals in there cause I have a chocolate chip starfish in it that is not reef safe. Also in that tank I have 2 clarkies and a file fish. What do I do about my main display tank?