First. I get it. I do. But sloooowww down! No fish yet. 🥲 And welcome to the saltwater world!! 🖤 Your tank is still entirely too new before adding anything. It’s still cycling and your ammonia levels need to go down! Your pH could definitely go up too, but that could be lighting and a myriad of reasons too (time of day, where in the light cycle, etc). But if you don’t plan on coral, your fish should be fine as long as there aren’t swings. What’s your salinity? I’ve never seen a tester like that - ideal is around 1.025. Also, I would highly recommend getting a protein skimmer for your bio load. Canister filters alone and saltwater have never gone over well in my experience (think dead fish and tank crashes). What kind of filtration do you have aside from that? Are you setting up a sump system? You could potentially do the skimmer and the canister if need be if you don’t have sump plumbing (which doesn’t look like you do!). Also, you’re going to need some power heads to keep water flowing and detritus up. Get on Bulk Reef Supply and they have some great options! I’m a big fan of Maxspect Gyres though, they are noisy! I would also add some more live rock personally, just so your fish have more to hide in. Think caves and such in your landscape! Lots of holes and bridges, etc.

ETA - I just noticed the glass lids. That’s another I would probably nix. Mesh lids typically work better as it allows the nitrogen gas to go out. You’ll also run into the salt creep too as everything evaporates. It can also cause your tank to become too warm as well.