Cool water holds significantly more oxygen than warm water. Warm water also encourages bacteria growth.
You can’t prevent bleach or peroxide from off-gassing, which is why you have to keep adding it every few days.
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ahhh the bacteria like anaerobic (no oxygen) conditions?
I did read flooming is especially good against bacteria. But after my first reservoir change my flooming pump was covered disgusting colored slime.
until now I was using the 100mm x 100mm x 65mm cubes. No veg. just from clone to flower. 60days flower.
buying 75mm x 75mm x 65mm would be cheaper and would produce less waste.
I don’t think it would make a difference to the plants? What do you think?
there would be even 40mm x 40mm cubes. but I think they are unsuited… 
Never mind I read your post wrong. 