Install a 60 mm pc fan that's 10-15 mm thick blowing inward just to the left or right of feeding hatch. It's easy if you just dremel off a corner of the fan (to make it fit), dremel the holes in the plastic, and buy two fan grates. The fan will then blow across the water and exit out the other hole you've dremeled. You can wire the fan to your moonlight adapter so it's on 24/7. You can even put in a rheostat like I did to make the fan speed adjustable.
I've done the above mod, but don't have pics. It'll drop your temperature at least 5 degrees.
Don't get a chiller, its too expensive and bulky.