I have not seen 5 gallon square buckets.... but a good idea.. maybe im blind tho.. so many pots in my local hydro shop.
To maybe help answer your questions about a need for a chiller with bio buckets..... Most people need a chiller because the ambient temps are too high, or there is bad air flow and the room is too hot.. etc etc... So thus there water temps get to high depending on the temps inside and outside the grow space. ventilation + a cold source for your rez and you've got an idea spot. As long as water temps throughout your cycles/grows stays below below 80F your in great shape! I know you wanna keep your water cold in hydro which helps with O2.
Cheers and happy growing!
thanks yeah I should be fine, my res is insulated and my res temps never get above 69 degrees F. thats with an internal pump an hot air pump, climate control baby haha but seriously what do you guys think of these uniseals? or other high end bulkheads to prevent leaks?