I have a 30 gallon Oceanic cube. I have five fish, four green chromis and a hector's goby. My watcham goby and my dove and nassarius snails are gone without a trace. I've lost several rainsford's gobys. My questions are: Am I maxed out at five 1" fish in my 30 gallon tank? Are ten blue leg and three scarlet hermits and a emerald crab too much for this tank and they are now preying on the snails and small fish? Thanks in advance for your opinions.