Okay, I currently have a 37 gal FOWLR. I'm in the process of setting up my 90 w/ built in overflow. I have a 29 gal that's been cycling for 2 weeks (with 40 lbs LR & a rancid piece of shrimp in it
). Problem is that I have to put the 90 gal in the same place as the 37. After testing and adjusting water, can I put the water from the 37 and the 29 in the 90? How do I transfer the current occupants of the 37 gal into the 90 and will I kill them in the process? Do I slowly add more water, or treat it as a huge water change? Thanks