"My garage is getting too warm, I'm gonna have problems if I can't chill the water."

How warm, is "too warm"?

Got 5 gallon DWC buckets on the lanaii.
The water runs about 85 ℉ .
Hotter, in the summer.
I don't use chillers.

Heat does not cause root rot.
It will accelerate any growth, including your girls.
But it does not "trigger" or cause pythium and anaerobic wee nasties.
The problem with hotter water is aeration.
Hot water holds less air.
If your air pump is sufficient to the task, it's no problem.

Dunno about Chinese, but that little one was talking Tagalog pidgin.
Ignore the yammering, read the body language.

Aloha,
Wee