try a 13 dollar aqua lifter set on a timer to replace evap every day. it take a little adjusting from time to time due to hot days vs cold days but my set up works like a champ. aqua lifter runs from 5 gallon jug to the tank and wham your done.
tunze is probally one of the best.
also check reef fanatic Level Controller w/ Dual Float Sensors. ive been running for 5 years and no problems and a little less money than tunze.
available from reefgeek.com, thats where i got mine..
