Depends on what your eventual plans are and how the corals are currently doing now. If your corals are all currently not doing well and melting/dying, then maybe rehoming them is not a bad idea for now until your tank becomes a more hospitable environment.
If they are not dying but just don't look as healthy as they should, then maybe its time to aid the natural/biological route with some technology. I like using the analogy of medical care. I am a purest at heart and would rather avoid unnecessary medication and just let my body heal itself and feed it the right things. But in dire moments, give me the meds and hook me up to whatever piece of equipment you need to for me to get better.
For your tank, when I saw it last, the only problem I saw was a cyano bloom. I don't really consider that a problem, more of a aesthetic preference. Yes, probably means your PO4 or nitrate levels may be elevated, but the real thing to look for is whether those elevated levels are doing harm to the corals? Or just fueling the cyano growth? If its just fueling the cyano growth, then continue forward and look for ways to lower your nitrates and phosphates while your tank finds its balance.
If your coral are actually melting, then I would look into some way of helping lower nitrates/phosphates more quickly... what's worked for me in the past is running a gfo reactor, adding a skimmer, reduce feedings, running biopellets, etc. I have always liked the idea of reverse light cycles with macro but look at it as more of an additional tool to aid in the fight against higher nitrate and phosphate levels than a hope that it'll solve the problem. Now if I had a 5000g macro tank, then that's a different story altogether but size ratio-wise, it will help some but not near large enough of a refugium to take on the entire battle.
One thing I must heed is to not make too many dramatic changes as your tank is still finding its balance with all the new livestock added. My nanocube was ugly for 5 months before it became the epitome of efficiency. My 65g had GHA for 7-8 months before it became a nice looking tank. My 125g spent the least amount of time in the "ugly" phase but I did transition things over slowly to the new tank and used the same liverock and tank water from the 65g. I did get cyano blooms and even a dreaded dino bloom as things were reaching a balance but they were far less dramatic than in the other two tanks. Point being, most tanks start out as ugly ducklings before you get the beautiful swan. So make changes to help it reach that stability and balance but don't make too many sudden changes and ride it out. I know I mentioned to you I don't do water changes anymore but regular, consistent water changes while siphoning out what cyano you can is the best remedy I see right now. Keep up with that and your tank will find balance on its own. Hope that helps bud and that I didn't rattle on for too long.
-Ty