What fish do you have? In my 50g I had 13 fish or so. It depends on the size of the fish, not the number. And it depends on your filtration, I ran that on a CPR BakPak II, and I ran an 18w UV sterilizer. No sump, no fuge at that time, and I had no algae problems with that equipment and bioload.
Coral Beauty, yellow tang, 2 clowns, firefish, 2 lyretail anthias, clown goby, scooter blenny, couple other gobies, and can't remember the other 2 right now.
Sand sifting fish don't hide in the sand at all, they hover around and scoop up the sand and sift it, my dragon goby is one of my favorite fish to watch! He is always out in the open, and it is great to watch him sift huge mouthfulls of sand and drop it everywhere (including my corals, I think he aims for them too!)
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