[i have crabs]

mine started nipping at my clams, he was doing it for probably close to 2 months before i cought him. the crocea wasnt extending much and was very jumpy anytime a fish went past, and the squamosia didnt care much, he never did any damage but he definatly was picking, he was also very busy chomping on the million other things in the tank so the clams might not have been the main target which is why they were ok. in the week after removing the raccoon the crocea is doing much better and acting normal again.