Hi glad to hear you got your moss ok, hanny the riccia is meant to do that it's more of a floating plant but can be tied down using netting or string etc.
Hi there I'm afraid I don't have anymore at present just waiting for it to grow back now as I did quite a severe pruning! I have a couple of other people that asked previously so I'll pm you all in order once I get anymore to see if you are still interested before I add more for sale on here, thank you