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Thallasia sp. turtle grasses are exceptional at nutrient uptake. Much more than Caulerpa sp. are I think. Eric B. has a write up on his turtle grass system on the Houstons club site (MARSH). I have some stalks growing back after a Diadema sp. urchin decided it was tasty. It is fairly hardy and likes silty type sand, bright light, and a moderate current.
That said, Caulerpa sp. are fast growers and might be better for you as far as availibility goes. I have real good growth rates with C. racemosa and C. sertulariodes, and would recomend either. As far as asexual reproduction goes, you might try the 24/7 on lighting, but I have never done it and therefore no experience to draw on. I just heep mine pruned and have no problem really.
hth,
Brad
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