As title, could I make a Moss Wall with Riccia instead? I'm thinking it would grow much faster and be a bit of a different look... Plus I have quite a bit of rapidly multiplying Riccia, and only a little Java Moss.
Yes it can, but it may go a little thin on the bottom, so just make sure you keep it well trimmed, it does like lots of CO2 and wont grow very quickly, Java moss grows faster in my experience.