if your scrubbing the rocks in the tank thats a bad idea , try pulling out as much as you can manually then target drop turbo snails on there when they leave the patch pick them up and drop it on them again. boiling water helps too.
sea hares work they are just fragile and need to be accimated very very slowly but one should clean your tank out in no time, any ideas why he died??
how long have you been v/ dosing???
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