Personally, my 4 footer kept at 26-27 degrees, co2 at 1 bps and low lights with low dosing of macro and micro ferts (2X55W T5HO) seems to be working well, new submerged leaves every now and then, with bucep's flowering too.
But I have a small setup in my room that's cooled at 27-28 degrees without co2, and they seems to be growing, albeit slowly.
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