I have a few bunches in my turtle tank - 4'x5' tank, about 200gal, with a 4' shoplight over it, so like 30-40 watts I guess. It grows slowly, but its slowly spreading out everywhere. I stuck a few strands in cracks in the driftwood, under rocks, and it kind of spreads itself out. Oscars may pull it apart but I don't think they'll eat it.