Originally Posted by ryshark
said if they are not getting enough lighting then they will NOT open all the way up. Is this true?
It could also go the other way- at least at first. The clam may start to stretch it's mantle more than usual, under less than ideal lighting, to increase it's surface area in order to capture more light. By the time a clam stops opening, usually it's pretty stressed.
I'd place a Crocea in at least the top half of the tank, more preferably top 1/3rd w/ VHO
have been putting cylcopes into my aquarium as a source of phytoplankton
Cyclop-eeze is actually zooplankton(animal based). You'll need a good phytoplankton (plant based) in order to provide the clam the proper food, assuming it's necessary. As already suggested, I like DT's phyto. HTH