Peabody---- I totally agree.. I had a squamossa and a hippo under about 7-8watts bet gallon of PC. They lived and I thought they were happy, but when I upgraded to MH, It was a world of difference. The perked up alot, extended their mantles more and just looked alot healthier. The squa which didnt grow at all under the PCs grew almost 1/4in in the first three weeks the MH was on.
mobius9oo--- I wouldnt do it if I were you... will a clam stay alive for a while in your system? If your water quality is perfect and unchanging it will live(i use the term "live" loosly). Will it be happy? most likely not. Do whats best for the clam, not whats best for you...
-----"How quickly do they grow. Will they actually grow that quickly under PC's opposed to MH's."-----
They never grew under my PCs. If they are not growing, they are not happy and healthy... JMO
Later
MAg