So the past couple of days my fishes are dropping dead all of a sudden. First day my 3" lawnmower blennie was found dead. Second my 3" maroon clown is gone. Everything was looking perfectly fine. All other live stock seems fine the maroon was hosting anemone just fine. I have a 6" black lion, 6" porcupine puffer, 3" valitini puffer and two 2" clowns. All the parameter looks fine. Ammonia nitrite is 0 nitrate is barely noticeable. I'm running a 90g fowlr right with 2 250w mh. I'm stuck, please any advice?