My LFS just got some Maxima Clams in and I since they needed strong lighting, was wonderin if my little 3 Gallon Pico's light it came with was good enough for a clam. The specs are 9 watt compact fluorescent lam and Half 10K Day-Light/Half 7100k Actinic Blue.
Sorry that's far from enough lighting. 3 gallons is also way too small for any clam. They can be very sensative to even slight changes in water chemistry and temperature.
maxima clam is considered one of the hardest clams to keep. in a 3 gallon with pc light, it will be very difficult if not impossible to keep alive. maxima or crocea clams need at last a 30 gallon imo, with t5 or mh.