My 55 is been runing with 2 filters for 2 years now. i just bought a 75g a couple of days ago. Now i put some brand new sand in my 75. i wanted to know if i do like a water change on my 55g .... like 10 g of water every 2-3 of days from my 55g and instead of throwing the water away i put it in my 75g will that work? i will do that like for 35g out of 75 g and make brand new water for the rest of the water add a a couple of rocks from my 55. Then i will put on one of my filters on it with a powerhead and make it run . all my equipment will be split on both aquariums in the mean while. until im done switcing completly...Will i have a to cylcle again?