Hello, I've just become the proud (first time) parent of 3 Crocea clams 2 nights ago and this is my first post to this forum. I just bought Daniel Knopp's book last night, but haven't had time yet to digest it all. I'm also reading all the back posts here as fast as I can and haven't seen an answer to this yet. I see that how much you need to feed seems largely dependant upon the size of the clam. When people refer to the size is that the size of the just the length of the shell, or does that include the width of the mantle when it is open? While I'm asking, is it common for it to take a day or two before the clam opens its mantle fully. Mine are in a 180 gallon w/ 2 400w 10k MH (soon to have a 3rd) and 2 140w VHO lights. For now at least the one not yet attached is on the sand (I will try to find a small rock for it today) and the other two are on ~3" high rocks, on the sand. Thanks in advance for your help!