One crazy ideas deserves another.
Dig a hole at least 4' deep. At the bottom put in a 150 gl.
rubber made stock tank. Cover the sump well with a sheet of plywood and
put a sign there so no one falls in.
That buried water will stay cool to cold, ground water is typically 65degrees.
Get a strong pond pump that will push enough head height to get out & up to your 55gl tank. Pump the water out of the sump/well and run it to your tank. Run an overflow return to the sump. Have that return go into a 5gl bucket 1st that is full of filter media.
drill holes in the bottom of the bucket so the water runs though it into the well/sump.
A good cheap media would be a commercial floor scrubber pads. Black are the most course, white are the finest. Have the water run through a black pad then a white before it drains into the sump tank.
You should be able to keep the 55gl tank under 80 degrees in the day. /Run a timer on the pump. Run the sump "cooler" starting in the am. run until sundown. Adjust time as need with summer heat.
If you do this a journal is a must.
PS - Toss me a little credit as your concept engineer.