28gal JBJ HQI - Heat issues
 

So, I bought this system used, and have started it up for a few weeks. The temperature always looked to be good to me and in a decent range. Tuesday my controller from Aquatronica arrived and the trending for temperature is showing that me checking the temperature at 5pm every day (Time I get home from work) was fooling me (It read 80F each time). The trend is showing that I peak at 83F by 10pm (Lights go out), and dropping to 76F at 11am (Lights turn back on).

Questions:
1) Where can I get a cheap chiller that doesn't cost $400 (JLaquatics for 90gal capacity)
2) Anyone have any bright cooling ideas that I could use (Downside, increased evaporation)
3) How bad would this temperature fluctuation be on clowns and BTA's? Right now I just have some chromis and damsels in there while I ensure the water parameters are perfect.
4) Why can't someone invent an ATO that drops ice cubes into your tank instead of water?

Weird. I have the same tank and mine didn't heat up at all. I've seen the hood elevated with legs. That would let the hot air out but you would have a lot more evaporation. I took my hood off and put on better lights. I,m just adding more water daily.

Yeah I'd agree with trying to get some air circulation in there with some sort of venting or fan rather than going to a chiller