Most likely some patches of the mini fissiden didn't grip as well on the wood, so they probably became abit loose when the plant mass got larger.
Usually when i tie fissidens on wood, i'll use a pen knife and score random lines on the wood surface to create more crevices for them to grip on to. That seems to help quite abit.
Even in lush thick fissiden mats, bits of excess fissidens will still sometimes detach on their own and float around the tank... usually attaching to other rocks, wood or even filter mesh intakes and then continue growing from there, i guess its like their natural way of spreading further.
Both fissidens and mini fissidens can grow in common local tank temperatures of 27-29°C (some chaps even grow them in 30-31°C temperatures too), they are very adaptable moss. Co2 helps but its not required for them to grow either (their Co2 intake is very low anyways).









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