need info on "red sea grass"

[ferret]

Most red macro algae only require moderate light & water flow ( also depends on the purpose of keeping the algae e.g. for display, nutrients removal etc ). Any cheap or expensive T5 & LED light fixture will do a good job for keeping various types of macro algae except for the brown algae. The best way to keep macro algae is in a reef system ( still ok for some species in the FOWLR ) and to stay away from fishes like rabbit, big or small angel and tang. HTH