[quote:2ada6ec3dd="williamng"]Is there any way to prevent riccia from floating up?[/quote:2ada6ec3dd]
when the riccia has reached to a certain thickness, you should either remove them and retie or u can weight them down with stones tied with riccia. But be caution that just weighting down might cause rotting from the bottom, which will have complication later on. please observe and decide :P
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