There are several ways you can tie your riccia , refer to YES's homepage for a pictorial guide [:]
I have noticed my yamatos and otos do graze near the riccia foregrd i have too but doesnt really disturb it much , as long as its tied down properly.
Even if some of it gets loose , still grows fast enuff to cover those spots where they came out.
I place the riccia on a metal mesh and then wrap the mesh with fine netting.
As for the Co2 top up , can try BioPlast ( Systems and Control Engin ). $15 instant topup if I'm not wrong.
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