Just light and some current. I guess it's primarily for nutrient export. Some fish like to eat it but it's usually pretty hard to digest. I can't think of any negatives ... unlike caulerpa or halimeda it won't sporulate on you making a mess of your tank. Pods and worms and brittle stars like to hang out in it.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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