Here is a picture of my diy moss tree: Now for the problem. I have Christmas Moss sandwiched between two layers of plastic canvas. The growth was going fine for a period and then the barbs began foraging for stray food among the gullies made by the plastic canvas. As the moss came in more they kind of move it back out of the way, just ripping it up and spitting it out, I do provide other veggies which they love. All in all I think I've cleaned enough moss off the filter intake to have covered these things 5 times. I was thinking of removing the top layer of canvas so there's not all the little spaces for food and stuff to get caught in but was wondering whether the moss would hold on, I can't really see a whole lot of root material protruding from the bottom. At this point I'm down to about half the moss I had at the height of it, so I kind of feel like its a "watch them rip out the rest of it or try something else" stage. Thanks for any thoughts or input.