what you do is get a cylinder to use, one that wont let light in and with a cap... glue some airline tubing in a tight coil covering the insidewalls of this, and fill the center with bio balls and cap it, the water should flow in through the top, through the bio balls, then into the coil at the bottom, and the coil should have a valve on the output to slow the drip to about 1 drop/second, let that drip into a skimmer or an area with alot of flow and gas exchange, like into the overflow drain or the chamber the overflow dumbs into your sump in. make sure it is air tight though, you don't want air getting in there of course, and when its first set up it helps to add a teaspoon of sugar to the tank, and watch for sulfury smells and if you do have any then increase the flow a tiny bit.