I don't understand this thread at all.
You have no coral.
A few fish.
You are dosing already.
You are trying to keep no3 down. No mention of po4.
And you are skimmerless.
What are you trying to accomplish?
From what I gather, you are new to reefing, want to add coral but are afraid to because your not sure your water is right.
Let me/us help you.
Skimmer gets out fish poop. Will help aid the no3 stay down.
Coral uptake calcium, alkalinity and magnesium. Along with no3/po4.
If you have no coral, nothing is uptaking those things. No need to dose for something your tank is not using.
Turn on that skimmer and dial it in. Pics if you need some help with the micro bubbles.
Take out those blocks for now, you don't need it.
Ph is low; who cares? No coral, fish won't mind.
But, when you do get coral, do you have surface agitation? Can you run an air line from the skimmer to outside? Those two things will help tremendously.
Alk is high; not the best spot to be in. But again, the fish don't care.
Coral does care. What is the alk of your salt? That plays a part of how your tank runs.
Think of high alk as a steriod, coral are all hyped up and want to eat. They start building skeleton and flesh (lps/sps), but wait, they need po4/no3 to keep doing this. Oh no, your no3 is less than 2 (<2). (no mention of po4) your coral will eat that up in a few days, then what? Burnt tips. (sps) no more food.
I run at 8 alk. Slower growth but it's steady, I have the availible food for them at no3 2 and po4 0.05. I feed enough to keep them there.
I hope this will help you in some way.
Edit: soft coral don't take up anything really in cal, mag. So if that's your plan disregard this post except the don't need to be dosing part and the skimmer part.