I have a couple of blood cichlids in the 120 Gallon tank. I am planning to go on a vacation for 3 weeks and would like to get a good way to feed the fish periodically. The flakes I feed is TetraCichlid Cichlid Crisps Advanced Clear Water Formula Personal Experience: I have used Eheim Everyday Fish Feeder before in my last vacation for a week. However, when I came back, the fish started wounds and holes on the head, which I guess is due to overfeeding. I am also wary of using this for 3 weeks in the coming trip ... because I feel that more food is going to be dropped by the feeder in the first week when the feeder is more full and there will be a lot less food dropped in the last week when the feeder is less full.