I tried this a couple times and the P's left it alone for a few days but then they just beat the hell out of it. Of course, I didn't give it much of a place to hide either. I've heard the blue crabs that Pedro has do okay though.
I had 2 blue lobsters, they do great. Just make sure you make a cave large enough for them to molt in (my first mistake), and one cave per (my second mistake). I still have one and the Ps dont mess with him, but he's pretty aggressive, and my Ps are well fed.
The first guy was forced to molt out in the wide open, and when they molt they are pretty feeble. Must have made a tasty treat.
They do clean up the scraps in a hurry, though. Actually, as soon as food hits the water he comes out and will sometimes take food from the other fish
My p's only ate a pleco when I severely neglected them. Actually, many times a pleco would steal a carcus away from the p's and defend it aggressively. It was very humerous. I think that the pleco's have tough skin, little meat, and don't taste good and the p's know this, so in general they leave them alone. I only lost a pleco about once every other month. They are much cheaper compared to the lobsters.
I just added 3 red crayfish to my tank. It has been 3 hours now and they have been cleaning up scrap ever since. If they don't make it oh well, they were only 79 cents each. They do look cool though. I have some pics but have to figure out how to post them.
i just put 3 red clawed crabs in with my four 5 inch rbp's about 8 hours ago, so far they havent stopped eating left overs, and havent been ate yet! :laughlong:
i think i could really get to like these crabs!