Let me answer your ?s...

Marlowe said:

check out this link... its the best one I found...
https://www.rollitup.org/grow-room-design-setup/208004-diy-do-yourself-water-chiller.html

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TFizz said:

hey, my plants are 5 weeks old, and still in veg, in MG organic soil, bottled water, no nutrients, 80 day 68 nights, 18/6, 2 fans, low humidity(is that bad for veg?), but as i was writing this i thought about it, and put 2 shot glasses with some water in there, hope that helps a little.

Anyway, here are the pics of them, some are older pics but they show the problem better.

basically the plants are very small, They did fine for a few weeks then i noticed the lower leaves of the plants would turn a light yellowish white, dry up, and then i would cut them off. any ideas on how to fix it?
View attachment 1319048View attachment 1319049View attachment 1319050

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disposition84 said:

Without the lower temps you're going to sacrifice a lot of dissolved oxygen,
but there are other ways to deal with the higher temps and preventing bad
growth in your reservoir.

Beneficials are a way of keeping slime/root rot at bay and are relatively
cheap to brew your own tea. There's a great thread on how to do so
found here: https://www.rollitup.org/dwc-bubbleponics/361430-how-breed-your-own-beneficial.html

Or you can go the route of using a conditioner like Dutch Master Zone
this will basically kill off any and all growth in your reservoir, good or
bad. So don't use the two in conjunction (beneficials and conditioners)
as you will kill off your beneficials and was them. h2o2 is also similar to
this approach as it will kill off growth in your reservoir. Many people
refrain from using h2o2 though as it's a harsh chemical and can have a
negative impact on your roots as well.

The benefits from a lower temp will be your best solution as you can add
your beneficials as well, and your DO levels will be optimized by the temps
being low and your rootzone will thank you for that.

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