That first pic looks pretty blue. Could be just the photo or a dusk pic. If not, then get some daylight in there for a good portion of the day. Clams are mostly shallow water specimens and could do more with the 6.5k to 10k spectrum which is loaded with just as much blue, but also the other colors. Squamosa are pretty easy to keep. As they grow, they can demand quite a bit of the big-three - check your water and you might have to up your dosing schedule.