cycled filter left for a few days.
I had my tank setup with this 2217 eheim filter. I went to setup a new tank and transfered this to it. I had to get another tank because of a defect. But I just let the filter sit there. After a few days I opened it up and it had a slight smell. It wasnt bad. Just smelt like a towel that hasnt been cleaned after it was wet.
So I shoved a air pump in it for the last few days.
Is this safe for my new setup? Or will the bad bacteria just kill anything in my tank?