Please help me figure out why my marimos are doing so poorly! I got mine in the group deal a few months ago. One of them was not quite in one piece, so I tied it up with some string. For awhile, that one (hereby referred to as "the small one") was in a 5 gallon with LEDs and the big one was in the 20 long with fluorescent lights. Both received Flourish Comp. When I set up the 10 gallon, the small one moved there. Neither of them looked very nice - both are kind of brownish and definitely not growing. So I moved them to the 55, where I figured they would flourish with 2x54W T5HOs, daily dry ferts, and injected CO2. However they haven't improved at all, and I think they look a little more brown. The big one started falling apart (losing little tufts) so I tied it up too. What else can I do to have nice happy green marimos?