Can you post some pics of the reservoir setup?
Theirs 2 things I would do from reading your post.
1. You must check the PH of the water. You can buy a PH checker along with up/down liquid for less than $20.
2. You need to wrap the 5 gallon containers with something that will reflect the sun instead of absorbing it. I know you said you are using something to cool it down inside but when it gets very hot that sun will make it like an inferno inside those buckets. Most dollar stores sell those sun reflectors that unfold and go inside the car up to the windshield of a car. They usually cost a dollar or 2 buy them and wrap up the baskets.
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