I've been feeding them 2 small meals of Tetra goldfish flakes daily, with Hikari daphnia once or twice a week as a treat. Is there a particular food you would recommend that has more fiber? That would make sense as to why my moor is having more issues than my comet though....he outcompetes her for food. I make sure she gets enough, and separate the two when he's being especially greedy, but he still tends to eat more than her. Is the extra food giving him extra fiber? So should I just be feeding them more or switching food entirely? I'll have to look up duckweed. We aren't doing a planted tank....do you do it in the tank with them, or grow some separately and give them pieces now and then?