Is that Algae?

Not that I can see but we've had a lot of pollen down here recently.

Do I keep slamming and bring it back up to 31FC?
I would- no sense in losing traction. You’re already so close to slam level might as well keep it there. Let’s knock this out.

Do another oclt tonight. Do Both oclt tests in the dark to be sure you have the sun completely out of the equation. I mean grab the samples in the dark 😁
 
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Doing chlorine tests every 15 minutes is not cheap either lol.
Just the one time to confirm your bleach dose is accurate. If you already sorted that out just test & replenish fc every few hours. At least 3 or 4 times a day. No more than once an hour.
 
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Not 100% sure so I will test again shortly to make sure :)
You can calculate your water volume at the bottom of this page
Be sure to enter the water depth not the wall height.
 

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