Well I know that my clowns are very aggressive towards me putting my hands in the tank. And Doug's clowns are aggressive too since they have started to lay eggs. with the crab may be you should get a picture up so someone can ID the crab. May be that who is killing the corals and Crabs do eat other things if they are dying.
A small coke bottle with the top cut out and turned inward always worked for me. make sure that is all that you catch I have used this method and ended up catching my shrimp.
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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