250 W MH, 110 W PC over 58 gallons. I'm more than happy to upgrade my lighting if need be, BUT I need a clam that will remain under 12 inches for its forseeable lifetime. Are clams senescent (Do they have a "lifetime")?
Kfisc, I too am interested in how many have kept clams for years and how large they have grown in that time. IMO if you aren't thinking long term then you should not be in this hobby, unless you have a plan for what to do with the animals afterwards.