Ok, a walking tour of my fish room. At the door! The rack you see is the center rack. (16) 20H tanks. Runs off its own air pump on top of rack. Rack has common sump that holds a little over 100 gallons of water. I am eventually going to use it for semi-automatic water changes. Extra sponge filters sitting on top. Make a left! You can see the rest of the center rack (8) tanks per side. I have lights at the tops of the racks (not wired yet). Top row of tanks are bare bottom, to let light pass through. Bottom rows have substrate. Less lights = less electricity. Looking down first aisle. Rack of (18) 2 1/2's on left, center rack on right and back rack with (4) 40Longs straight ahead. Make a right! Can see the rest of the back rack. I have AquaClear 70's on all the large tanks. Everything else runs on air driven sponge filters and corner filters (with carbon) to keep the water clear. This is the larger air pump that drives everything except the center rack. I also heat the room and not the tanks. That little heater keeps the room toasty. Again less heaters = less electricity. Make another right! Far rack has (2) 50's and (12) 10's and you can see the otherside of the center rack. Heading back out of the room! Every room should have a dehumidifier, moisture can ruin a lot of things in a house. Another view of the rack of 2 1/2's. I put holding females into a 2 1/2 until she spits the fry on her own. Some spit pretty early when they know the fry won't be threatened. I grow the fry out a bit and put them into a larger tank. Given space, fry will grow quickly. I have a 75 and a 90 outside of the room. They are going to be used as "show tanks" with lots of rocks and lights. Don't have a lot of fish at the moment, the center rack is cycling. Will be able to move fish around in about 3 weeks, then the fun starts. Hope you enjoyed my fish room. It is a work in progress, not finished yet! Should also mention that it is 14'-10" x 11'-6" (about the size of a normal bedroom) there are 52 tanks in the room and I still have room to work.