Black means he is bouncing. He started the bounce the pm cycle of 1/21. He looked like he was about to clear yesterday but then popped back up, wobbled a bit, and then hit black. That is very characteristic of a high before the break. Obviously, I don’t have a crystal ball but it is a pattern we see frequently and it sends up a red flag as he was high at those numbers at mid-cycle. Again, no crystal ball here but I would test by +2 or +3 at the absolute latest since he was already headed down.
Let’s see how he does tonight before you reduce the dose tomorrow. Sometimes, that green was just a bit of an anomaly and he might actually need 5.75u.
You will eventually get a feel for when you should take the dose back up and when you should wait. Not every instance will look like this one or have the same outcome.
Generally, we do not want to take the dose back up if it is evident the bounce is starting to clear. We want to let it clear and then increase if we need to do so.