I have a 20 gallon aquarium with 5 gallon sump. It has 2 /14 pieces of live rock and one is a cave. I have a scarlet skunk cleaner shrimp and pygmy cherub angel that tend to hang out in the cave. My other fish is a pair of clownfish and they have an anemone. (There is a skimmer and a heater btw) I have two turbo snails and more than 5 hermit crabs. I plan to get a starfish that is reef safe (does anyone know if chocolate chip stars are reef safe) I want to know if I can put some other fish that is reef safe in my tank.