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Yeah riccia gets messy. I only liked it when i stapled it to the wood and it grew like a little tree. Jothy showed me that trick when i was picking up the plecos.
I put it on rocks & then secured it using hair bun nets. You twist it around and around & it holds the riccia in place. It quickly grows up & through the netting, until you can no longer see the netting at all. Of course, you still need to trim it, and that's where the mess comes in. My rocks were all small enough that I could remove them from the tank & trim them. But even though I'd rinse them in old tank water before returning the rocks to the tank, little cut bits would always rise to the surface.