Cilantro
Aquarium Advice Freak
If I had one fish tank completly cycled and put another fish tank with no gravel and usEd a filter from that same tank and half of the tank was filed with water from the cycled tank would it be considered cycled? Our would new bacteria have to form remember filter and half of water will be from a completly cycled tank? Anf this question is just random can't sleep and came to my mind