hawk fish

hello everyone So I wanted some advice , have had my 20g tank for about 2 months now. Had a starfish (sand sifting) in my tank that I noticed was missing a limb one night to the next , and by the 3rd night he only had 2 limbs left. I have a hawkish , 2 saltwater Millie’s and a hermit crab I...

Hello all, I am new to reef2reef. I set up a 20g tank a couple of months ago. It has a yellow tail damsel, clownfish and flame hawk fish. They are all about 1.5-2 inches long and get along pretty well. The damsel gets upset when the clownfish goes near his rocks but everyone generally gets...