well, it is either that or spend 700 to 1000$ just to cool 25 gallons, and possibly cost nearly as much to operate, or have poached fishes, they can take some temp changes, but drastic and fast is VERY lethal, IMO, it would be cheaper ot upgrade to a new ac for your apt., and benefit all of you guys(and be more efficient if you buy properly), these are fish, not wall ornaments, and i love mine, jsut as any other pet(not even to mention the $ involved),
so your 3 options are as i have mentioned, (ac, chiller or risk it)
sorry but
those are the facts IMO