For three years, my 3 crabs have all gotten along. The last couple of days, tho, I've found my Large crab (half dollar size shell) standing over my Medium crab (maybe Quarter size)with the tips of his legs inside Medium's shell. Medium obviously is holed up inside his shell, and there's lots of crab smack-talk noises going on. I separated them, and Large went right back after Medium. I separated them for real that time, putting Medium inside a small plastic cage I brought him/her home in, and left him (with sand, food and water) overnight. Large climbed to the top of their driftwood, while Small stayed at the top of another piece of driftwood, and they all remained that way for a day and a half. I took Medium out, and they seemed to be ok...until the next night, they were in the same position (Large holding down Medium). I separated them again, putting Large down on the opposite end of the tank from Medium. Large proceeded to take out after him/her, and Medium climbed into the water dish, across the bottom, and up the other side, and kept going, I can only imagine to get away. I separated them again. Last night, they were all loose in their 20 gal tank, with Medium sleeping on top of a plastic palm tree, while Large climbed the tallest driftwood and slept next to Small.
I am so confused about what's going on. Why all of a sudden are they not getting along? What should I do? Also, should I get more - would that temper the bullying, if that's what it is? Please help. I have found such great advice from this site, that I have immensely enjoyed the change in my crabs from no activity when I first brought them home, to continuous activity every day. Thank you in advance for any advice you may have!
