The weather's been fairly nice until this week. 100 degrees today, and our little wall unit a/c can just barely keep the house comfortable. I've pulled the hoods off my 2 5gal tanks and they seem to be settling at 76-78, but I just lost a dwarf puffer to (I'm pretty sure) columnaris, which apparently thrives in warmer temps and lower oxygenation. The oxygenation is actually up b/c all the tanks have lower water levels thanks to evaporation, so the HOB in the one tank and the canister in the other are creating quite the waterfalls. The tanks did go through some wider temp swings last week until I got more aggressive about trying to keep the temps down. Anyway, is there any method of keeping the temps even lower? The hardest time, of course is that godawful stretch from mid-afternoon to after sunset. I suppose ice packs around the tanks might help, but wouldn't they only last a few hours?