I own two of them. Have had nothing but amazing luck with them as well. They have cuase no harm nor created any problems. I spot feed them mysis and chopped seafood bits 3 times a week. When i get moved into the 140g i plan on a few more.
You can "plant" them in your rockwork by putting a cap on the end of some 1 1/2" PVC and filling it half way with sand. You then put there tube in and fill in the sand around it. that way you can have them in higher spots and well as the sand lvl.
I am not a pro by no meens but will try to answer and questions you have. As for the crab im not sure sorry.
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