I have a Clown Trigger (2 1/2in) that will not eat. It has been in a well established tank for about 6 mo. It went through a similiar spell about 2 months ago but a quick water change perked it right up. It has always been a voracious eater. Loves dried seaweed, dry pellets ,Formula 1 frozen food. I did a water change on the 7th(feb) and had a water test a couple of days later which showed nitrates way up(100ppm) I was recomended to do another change after a week which I did on the 16th. Anyway, the fish is active it just won't eat. Any ideas??