just thought I'd mention it because there seems to be a lot of talk about how they don't do well in gravel. Admittedly I have easy-to-grow plants but my anubias nana is growing fast, imo, even though it's supposedly a slow growing plant. A few weeks ago I pruned my hygrophilia polysperma and it's overdue for another pruning. The tops are almost out of the water and they would be if they stood up straighter. My cryptocoryne wendtii had a rough start because they don't like being moved, but it's growing and about twice the size it was when I got it a couple of weeks ago. My aponogeton bulbs are just insanely out of control. I'm planning to add some java fern soon but that will be on driftwood so maybe substrate doesn't count with that.