My 180 is finally plumbed and tested and ready to go. The cycle is nearing an end (ammonia and nitrites 0, nitrates still high between 25 and 50). I cooked the rock from my 150 and it's all phosphate free, fully cycled and ready to go. Do you think I could add the rock into the 180 and let the tank finish cycling? I'm thinking it can't hurt the rocks, the water or anything else.... I'd just like to clean up the buckets of rocks that I have sitting around! And then at least my tank will look prettier ;D