I have a 55gl. it has a flamehawk ,tomato clown, 6 line wrasse and a fire shrimp all are no more than an inch or inch in half.I was feeding them a 2 cubes a day. I was told I am feeding them to much. is one cube a day enough or to much? how much should I be feeding them and how often? how often do you feed yours? thanks for any advice in advance