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1. - Steady high CA and ALK. Stead SG and PH.
2. - I've never seen it done successfully. I saw a beautiful tank with 4X65s try a few maximas and they all bought it for what it's worth. I tried lower light clams (squamosa) under 3X55w in my old 15 gallon short tank. He wasn't very happy. Didn't die, but wasn't happy until I switched those out for a MH bulb.
3. - Many fish can be clam nippers, mostly angels, blennies, an odd tang, etc. Any non reef safe invert is bad news for clams too.
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