I could be pleased with an 8 degree drop.

Aaron, have you ever put a fan in front of the mini-fridge's fan? When I did that, the one I have taken apart went from cool condensation to making frosty ice out of the condensation. Or in other words...from 47°F down to 22°F in just a couple minutes.

I'm on a path now to try having a cooler on opposite ends of the solution tank...two of them, in theory, connected by either a solid bar, or a water filled pipe ought to do the job.

Key word...'theory'.

wtf though....cheapo drop in heaters have been around for decades...am I really going to have to buy a portable a/c, tap into the line, fashion a drop in coil of copper or plastic tubing just to beat back room temperature water?

Ehh...that or wait till the weather cools off!

Seems that what I'll end up doing is going with the design as is, and end up having to supplement the amount of available O2.

Or, pH a bunch of water and make some nutrient popsicles...not!