I have a surface skimmer for my regular filter that seems to work a charm (though I don't have anything living in the tank yet). I bought it at petcetra for like 10 bucks and it adjusts to the level of the water, even if you get tonnes of evaporation. When you first turn the filter on it bobs up and down till it gets set to just skim the top of the water and then it maintains itself at that water level even if you go down 3/4 of an inch.
Hope that that helps!
In desperate need of help, but very excited to learn. I have tasted the world of aquariums and now I'm hooked.
Here is what I have now...
maxijet 900 powerhead
100W (maybe 150W) heater, but heating isnt a prob
1.5 inches of crushed coral
some decoration stuff including a couple peices of old dried coral.) Not sure if it is real to be honest...
Crappy lights that I am going to rebuild, just for come flourescents