After fully reading the thread have a few more to add:
We are in the same mindset, fish are cool but coral is where it is at! With this goal in mind stability is king, especially if you get expensive taste alot of those pricy corals are picky. It is not impossible to have a successful tank on just a canister but it does bring certain challenges. Would recommend looking into a way for a sump via overflow or drilling. HOB filters and skimmers work as well. I wouldnt rush into these purchases but keep in mind as you go forward
Tests are next that you really should invest in. Many old heads will argue they dont test they can just watch their tank to see if its healthy or not but as a newb you dont know what to watch for so ignore them till you start to agree with them. In my above post I shared that my preference is Hanna and they are very good ( with exception of their mag and salinity tester) and a refractometer is a
MUST. Salifert is a cheap way of getting reliable tests and getting familiar with what tests need done more often and thus want to upgrade to something faster/easier. Some test you shouldnt worry about at all until you have a full blown reef and all. In order id personally purchase:
Tier one: Refractometer, thermometer ammonia badge, nitrate, phosphate should have now. These are your main nutrients that can and will make/break a tank and if you ask for help what people will first ask for.
Tier two: ph, alkalinity, once you have some established coral this will help make sure they are happy.
Tier 3: calcium, mag this is where youre getting more serious and having decent amount of growth from your lps and looking into getting nice sps and about where youre thinking of starting dosing
Tier 4: trace elements the tests for these are usually a pain in the butt and wildly inaccurate if you make the slightest mistake and costly. personally i just rather send the water to lab to test for these levels and go based off those recommendation. i wouldnt even worry about this kinda stuff if you are doing constant water changes or just have an insane amount of coral and growth going on.
The economics and logistics of buying water and hauling it alone make an investment into a RO system worth it. You can never really be sure what is going on at the lfs with their filter, locally we had 2 tanks crash as a young worker didnt rinse the tank well after cleaning and had bleach get added to the salt tank. Nothing nefarious but mistakes happen. With your own you can be in control, I personally have a 5 stage as i got a good deal used but with your water it may need more cause hardness. Just call into brs or ask our resident ro specialist
@Buckeye Hydro what they recommend for your situation, both are pretty helpful with that stuff.
Ugly stage gonna ugly stage just dont let it get out hand. Right now you you have a whole ecosystem that is ripe for growth and with no coral or comepting "good" algae the fastest wins. Pull and remove any hair algae when it apears and slowly add snails and other cleanup crew as you increase your nutrient input ( ie feeding, coral powders, fish poop from more fish). Also think of adding a few utility fish as your tank grows to help take care of the algae. Blennys do great eating algae, urchins if you dont mind the side effects, small tang like a tomini, diamond goby for cleaning sand, etc, This is not a shopping list but just suggestions. Test your nitrates and phosphates make sure they are not elevating too high and that will help keep algae down but also remember that if you have an insane amount of algae it will test low because it takes up the nutes before you can test for it.
And remember the number 1 rule:
Nothing Good Happens Fast