09-03-2010, 05:51 PM
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To be honest with you, that tank sounds fully stocked as it is now. Adding animals, including inverts, will only add to the waste levels, not to mention aggression. Chocolate chip starfish are opportunistic feeders and will eat almost anything they can catch. Inverts are typically easier to catch than most fish. I surely would not put more fish into this tank.
It would help to know how much live rock is in this tank and whether it is a 20 high or a 20 long in size, and what type of filtration is being used? Also, water change schedule and water params for ammonia, nitrite, nitrate, pH, and calcium? (the water params will better indicate how much "room" there is for any additions of animals where waste and mineral content are concerned)