I have a little Crocea clam (note* supposedly rock dwelling) continued to move itself onto the sandbed no matter what I tried! (I even built a little rock fence to prop him up!) The clam ended up taking in huge amounts of water and propelled itself back down to the sandbed.
It has however stayed put once it finished moving...kinda reminds me of an unhappy anemone really. Very beautiful to have!
Clams also get food from filtering water, so I personally believe they need to have some food in the water, but nitrates and phosphates are not the only thing that feeds clams IMO.I figure that's where the confusion from dirty or clean water comes from. I put a little bit of Reef Roids and Marine Snow in my tank immediately after a water change (note I do weekly water changes with RO/DI Type 1 water), and all my params are 0.0ppm NH3,PO4,NO3 ect.
My clam seems to be happy with moderate flow and only gets pestered by the odd hermit crab climbing on top of it.
I unfortunately do not know too much about Maximas, Derasas, and Squamosas, other than that they prefer sand bottoms and can get very large.
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