Mine became quite aggressive. Snatching at the fish and grabbing at my shrimp. I chose the shrimp over the crab! I don't think he could catch any large fish but worried about the little guys getting to close. I also read that the males (which mine was) are more agressive whereas females likely never become fish-hungry.
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Red Coral Online Store 
www.redcoralaquarium.net
45 Gallon Cube with 10 Gallon Sump, Lighting 8 bulb T5, Vertex IN 80 Skimmer
-2 Occelaris Clowns, Engineer Goby, RBTA, Peppermint Shrimp
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