Hello,
First welcome to R2R and we are thrilled to have you. This is an amazing forum, and honestly pretty much everyone has some good advice and some may say this way or that etc.
For what it’s worth keep in mind every single reef tank is literally different. What may work for me, may not for others and you get the gist. When it comes to testing yes you can buy better test kits. Do you really need to them no. Yes api are cheaper test kits but still have to pass inspection and gives you a pretty close reading. Is it exact no but doesn’t need to be. I have a 240 gallon that is sps dominant and I have only used api. Have I had great success yes, have I lost some corals yes. 99% of the time it’s do to my error in everything else but testing.
The same goes with lighting tons of advice and never ending debate (although I actually have not ever heard of your lights ((doesn’t mean they are bad)) but so many new ones coming out it’s hard to keep up on them. With this said, you don’t need to spend tons and tons of money to have a nice reef. The only thing that matters is that you appreciate your reef tank.
There are some things you need to do right and others you need to Make sure you do not do. One is do not get into chasing numbers, won’t help and you will go insane. I have seen sps dominant tanks here locally that have 40ppm nitrate and over .50ppm phosphates and are amazing. My tank is use to lower nutrients so I have problems when they go up. Your coral and fish will adapt to your parameters, whatever you make them keep them the same that is important. Secondly (ammonia any trace will harm your fish FYI).
The ugly stages of a tank, again all different I cycled mine for 90 days. It worked well and not many issues, I have seen others half the time of yours and they did fine also. I have seen th flip side on both waited 90 days and nothing but issues and also went about two weeks and nothing but issues (which is why every tank is different).
The story of lights on or off. Generally with fish I have turned my lights off or just maybe one blue light on. Corals however from softies to sps, I just accilmate them and I reduce my lights. They are never off, but I have never lost a coral from never turning my lights off. Lost corals many other ways, lol that’s not one.
I will say every ones advice is good, but you have to pick and choose which one to use on your tank. We would love to see pics to help you further. I do wish you lots of success in this fabulous mysterious hobby.