Hey guys, I currently have a 15gal tank and I am looking for a 10gal or larger because my platies keep having babies and I'd love to keep them. I was just wondering when I cycle my new tank can I take half the old fish tank water then fill the rest up with treated tap water for the rest and cut my used sponge filter in half and put that in? Would it be cycled right away or would I have to wait and for how long?