I think I'd like to go a different direction with my tank (established for 6 years) and go back to the original Nano top and a few small fish. Squamosa clam is about 8" - $150, Maxima is about 6" -$100 - both very healthy. If/when both clams are sold the HQI-24 light fixture/ballast are for sale - 150w metal halide, 24w blue fluorescents. Will make good deal if want all, located in Castle Rock.