I'm trying to get my tank back on track using TM Reef Actif, carbon dosing and dosing live phyto (750 ml/day). I've been dosing Reef Actif for 8 weeks now, starting with small amounts but are now at full dose.
Tank size is 750L (200G), sps dominated but with a lot of lps too, been up for almost 3 yeas now (huge issues with GHA and RTA first year) and are again having the joy of lots RTA again and some cyano after it almost crashed last summer, but are now succesfully adding coral

I feed frozen food heavily and my fish are fat and healthy - They say Thanks to Paul B. ;-)
This summer my tank overheated for several weeks, due to the hot summer. I had no cooler , my house became very warm and I had to travel .... I lost like 80% corals and several fish - my tank crashed. I guess the heat started a bad spiral resulting in high ammonia and afterwards high P and NO3 (NO3 was way above 100).
It has taken me a lot longer than expected to get the here, but I think I'm on the right path. Next "minor" goal is to get rid of the RTA.
I've started to see good progress for the last week or two.
Lots of small patches not having RTA where it use to grow and longer between the glass cleaning (wasn't aware of this as a parameter before this tread). But also lots of the corals look better, and the KH comsumption slowely increase (increased calcification = more growth).
I changed the circulation pumps two weeks ago, which also have an impact, but if the RTA and cyano dissapears, or gets reduced to small patches, I'll consider approach of carbon dosing and Reef Actif to be a success