Reservoir - how cold is too cold?

I figured you hydro guys (DWC) would know about water temps as it is so critical for you. I know lower temps have higher O2, like 68 is ideal I believe. But if you get much lower like in the high 50s will that cause stress to the plant?

62F is what i remember being the lowest you want to go.

I believe what it is, is water does hold more DO as it gets colder, but you get to a point you slow the metabolism of the plant.
I'd agree no lower than 62.
68 is perfect, only reason I see to change that is if you are late flower and want to "fade" your plants. Cold rez can help bring out those colors

ÒÒlegilizeitÒÒ said:

Cold rez

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room temps more so than res temps IMO

rkymtnman said:

room temps more so than res temps IMO

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Yeah, cold rez, cold room, no nutes. Brings out some great color for bag appeal

Too cool will really slow growth and limit phosphorous uptake.