Where'd you get the fan? I live in Alabama and while my downstairs tank is doing fine at 72, the new shrimp tank I just set up is like 78 without a heater or anything (despite the house being at 73...). I'd like to keep OEBT as well so I'm trying to figure out a solution before I start stocking.
Although I have a Fluval Ebi for these guys and I'm loathe to take the top off since it looks so clean and minimalist with it, I'd also like to get them not dying
I'm enjoying your tank journal as well, looks like it's coming along nicely!