Aquariums: Time to do a Ghost-Feed test?

First picture is today’s readings, the rest are the logs (that I’ve kept, since for the first three weeks I didn’t have a test kit (forgot to buy one and had to wait for my next check lol)). Think it’s time to do a ghost-feed test? I’m not sure if it’s fully cycled or not yet, and I’ve been told ghost-feeding is the best test for that?

Also side-question: Tannins. The tank’s in pre-use currently (just plants, not really any hardscape or much else, no living animals) but when i eventually get it fully set up I want it to be for a betta and a handful of red crystal shrimp, and I was told tannins in the water would be good for the fish+shrimp? What would that do to the water levels? Would it be safe for the betta+shrimp?

But I’m not sure if that’s a good idea since a lot of my plants are red or white (need large amounts of light so I plan on basically getting floodlights if I try the tannins too) and I plan on doing small amounts of Co2 injection (once I figure out how that works) for the plants too. Am I grabbing at too many ideas at once here?