An AC unit does sound logical. Another thing I forgot to mention was that you get more evaporation with lower relative humidity. I noticed that you have multiple tanks in the same room. This could be driving up the humidity preventing proper evaporative cooling. An AC should help this, but in the meanwhile, try venting the room with a fan flowing out the door/window.
Lastly, try eliminating a few of your powerheads if possible. I've got just two in my 45 bow on a wavemaker and everything's been dandy.
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