Kathy writes: > The two biggest problems with implementing a system like this are >getting >all the tanks drilled and what to do with the water coming out of the >tanks. No, No, No. Don't drill the tanks. That reduces their usefulness in the next iteration of your fishroom Set up a siphon of PVC pipes and elbows. It can drain over the back to a plastic peanut butter jar, a plexiglass "triangular catch pan" glued to the back/side of the tank, or anything else that you can attach a drain to at the desired height. A piece of sponge on the mouth of the PVC in the tank will keep fish from getting across the barrier. To attach the regulating drian, mark the location on the "receiving tank" (eg: the peanut butter jar) where you want the water line on the tank to be controlled at. Then you drill a hole, glue in a little piece of stiff tube/pipe, then stick some hose to the tube and run it to a rain gutter, which can be set up to collect all the runoff at a central location for disposal. You can also put the RO water storage tank above the tanks in the room, run PVC over the tanks, stick brass air valves in where you need them, and set them to drip at the desired rate into the tank. Then you get a continuous water change system as automatic as your RO unit or other storage tank filling system. Count the number of drops in a given volume, like a ml or Tbs, add that up to figure out how many drops per litre/gallon, then set the desired drip rate for each valve by counting and timing. Then just check the drip rate once in a while. Flow rate in equals flow out + evaporation, and ther you are. Forget the pooter, it is more high tech than needed. Bob Dixon ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@majordomo.pobox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@majordomo.pobox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!