I have never kept a nice clam before, and just bought 2 maxima clams. I have researched them for a long time and know mostly what I need to know. I have been warned that I may not have enough light, and will get rid of them fast if I feel that they are not thriving. I basically want to know if anybody can tell me the first signs of insufficient light, and how long it might take to notice so that I can carefully watch them, and find them a new home if needed before they decline. I have a 75 gallon w/ built in the back sump that cuts my useable space down to about 55. I believe it's 18" deep and I'm running a 48" 4x54 watt t5 w/ lunar lights and 2x 24" 2x24 watt t5 for a combined 312 watt t5 ho with half of it being actinic. Although, I also have cheap fixtures and most of my bulbs are cheap too (that is where most of the concern came from).