Dude, you found a keeper
Glad it turned out mostly OK, but seriously this is a good reminder to design a system that is not dependent on working AC to maintain tank temp.
Chillers work well but are pricey, require a pricey controller or a clever DIY with a dual mode high/low controller adapted from HVAC, not to mention the added cost of running a chiller
Sumped tanks are easier to deal with temp wise, esp if you have a auto topoff that holds like 5 gals of water. A couple of < $10 clip on fans from Wally over the sump will usually do the trick, Canopies that open from the top are good, even cabinet doors that open wide are good, you can clip fans there and get the airflow going, evap will drop the temp so the trick is to have 2 heaters, one set at normal temp, the back up 2ºF lower, and a large top off reservoir , esp if no one can be there to watch .
Caveat, the higher the ambient humidity, the less effective this is, tho in hot weather venting the room should keep the hoomidity down to where evap cooling works to some appreciable degree.
Ugly hot muggy days in the deep south, may require, serios AC and Chillers, Casey or GregT , Roger or several others can address that better than I.
I live in So Oregon, and usually the humidity is fine except for the occasional thunder storm on hot days, we get temps in the 90-100s that are not that bad. Up in the Portland are with all the big rivers and higher humidity, 90º days send folks to the hospital
