Ok guys, heres the layout of the tank.

It's a small 20 gal Tropiquarium (over 10yrs old) with a biolife filter. Apparently this is only popular in the UK now, since thats the only place I can buy carbon filters and accessories for it


Anyway, within the tank are at least 10pds of live rock, 4 Damsels and 2 shrimp (1 cleaner and 1 fire)

My question is about feeding. Before we got the shrimp (yesterday) we were just feeding the fish flakes. Since the shrimp need meat, we got frozen brine shrimp. The man at the store advised 2 cubes (these are small frozen cubes) a day. 1 in the morning and 1 at night.

But that seems like A LOT is left over. I know the shrimp are scavengers, but I think it might be overkill with 2 cubes a day. Any suggestions?