I have an old tank with some clownfish in it (that I need to quarantine) that I’m planning on turning into a quarantine tank. my plan is to remove remove everything from the tank except the water which I will put back in the tank. then add some filter media from my other established tank to instantly cycle the tank and then put a sponge filter in or a hob filter, then clownfish back in and start quarantining them. Will this work? On other forums and stuff people say that if you just put some old filter media in your tank it instantly cycles and you can put fish in right away, is this true.
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