OK so I had a 10 gallon tank with a tetra Whisper 10 filter. That tank cycled well after 4 weeks or so but then I transferred everything to a 20 gallon tank. I have added an Aquaclear 20 filter and currently have them both running. At what point can or should I remove the original 10 gallon filter? And would be be smart to get that back into another tank (without fish) to keep it cycled? Or will it be a mute point without fish in the tank? Any suggestions here? I'd like to set up a hospital tank.
Edit: the new setup has not cycled yet
Edit: the new setup has not cycled yet
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