How big of tank ? What did the crabs look like claws ? Are the crabs hairy? I had a few nuisance crabs and worms in our old tank, chances are if ther are two they maybe more or other pests. I caught the ones I had at night using a light and trapping them out of there hiding spots. U can try the cup and krill might work too if u can keep all ur fish snails and crabs out.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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