If is velvet u need set up another tank to keep all your fish until your main tank 1-2month fishes then can put it back if not now u put back also no use velvet will kill it in few days time Sent from Singapore Reef Club mobile app
Check your kh ph and isit once u change water it become like that some time if u change too much water never add anti chorine will cause this too Sent from Singapore Reef Club mobile app
Bro flower tank is fish only tank if your is flower ick is not a problem because u can dose copper to cure it fast Sent from Singapore Reef Club mobile app