You have a sump? I have a wally world fan under my tank-top (lol) and also have one blowing across my sump. Do you have a controller? They are great to have because most of them you can configure to turn off your halides at a specific temp. My ACjr lets me even assign a waiting time for the lights to come back on. I use a ghetto chiller; milk jugs with frozen water in them. it makes a difference on a 200g, so it should make one on yours! You should be able to find a water bottle to fit in the back chamber, maybe a small fiji water bottle? It should be of major benefit.