Hi, I have been feeding my saltwater fish once a day for the last two years because I leave the house at 6am. and usually don't get home until 8pm. None of the fish have died or been sick in the last two years. I think that feeding twice a day is more ideal especially for fish that like to graze all day long on algea. I tried to feed my fish some of that dried green algea that comes in sheets on a special feeder clip and it was rejected. Last week when I got a bicolor blenny I took a piece of this sheet and attached it to a small rock with a rubber band and all the fish went for it, even the ones that had not touched it before. I think they were afraid of the clip...did not look natural. I am going to try to place this on a rock before I leave at 6 am. and then feed the flake or frozen or live food in the evening so that they can eat twice a day. When I leave at 6am. the fish lights don't come on for a couple of hours. I think that this Seaweed Selects dired green macroalgea sheets can stay in the water on a rock without dissolving or rotting until the sun comes up at 8am. when the fish can see to eat it. This food is high in protein and is a good supplement to the diet. It says it is a good food source for tags, angels, wrasses, damsels and some butterflys. I am going to try to put some on a rock at 6am. tomorrow (my day off) and see if it is still there attached when the fish wake up. If I place it in during the day they gobble it up in a few minutes. I forgot to mention that the shrimp and craps love this too. Lesley