I agree that it they might starve to death competing for a food source. IMO
1 per gal
is about the most you would want and only if you have 1.5+ lbs per gal
for them. I actually prefer/recommend one per 2 gal
and I keep around 20 in my 55 with 90 lbs of lr
and it's just about the perfect balance IME without having to supplement feed them.
You have plenty of lr
in the tank but very little algae growth so I'd return a couple to the lfs
or give to a friend. You could supplement feed them but IMO
it's not worth the risk of fouling such a small tank.
From the progress thread
I gather you don't have any other fish/mobile inverts in the tank and only a few corals at this point.