JeffMuse;699285 wrote: I would recommend using fans/ air cooling to lower temps on your tank before considering the more expensive options such as a chiller.
If you are using a setup with a canopy, you can install 2-3 fans (I like the Ice Cap fans) and either use them with a controller that has a temp monitor, or have them set on a timer to go off when you MH/lights are on. Air flow over the surface of the tank will lower tank temps approx 2 degrees.... just make sure that you do not have too much air blowing on the tank in the evening as this can push your temps down to 75-76 degrees if you are not careful!
I hope this helps. :thumbs: