some clam questions

Well, I had a 29gal for about 8 months with a crocea in it that did great. I ran a tek light 4X24 watt T5s. T5 lighting is perfectly fine for clams. As long as your other parameters are in check (calcium, alk, phosphates) a clam or two or three can do just fine under that kind of lighting. However, don't rush out and buy one first thing. Wait until the tank is matured (at least 3-4 months IMO).
 
T5s with good individual reflectors would be great for clams. In a 29, I'd recommend a T. Crocea since they don't grow as large.
 
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