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In my experience, I found T5's to be absolutely terrible for growing any clams, even when placed 2 inches from the surface. Also, I had 300W of T5 and had these problems. I was able to grow clams successfully under 150W HQI (10K & 14K, but not as well under 20K) but coloration was less than desirable. However, when placed under 250W or greater HQI the results were excellent! Also, ionic stability is key to calcification and expansion of clams, so I would suggest a bit larger water volume, although it is very do-able.
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