I'm still trying to get a grasp on the whole situation...
The first link below is the thread I was thinking of earlier.
What happened to that stuff growing in the pics? Did you confirm it was dino's or just hair algae with detritus in it, or what? May just have been an effect in the photo, but it looked slimy to me.
Did it really turn out to be a side-efffect of the wrasse keeping your CUC at zero? (Very possible, just wondering if that turned out to be it.)
So now that there's a CUC the algae is just staying mowed?
I also found this:
This tank is still <1 year old, right?
If I were you, and I wanted the numbers a lower I'd do a couple more big water changes....but you're still going to have an imbalance of N and P.
If things still don't straighten out
in the long term then I would suggest a slight change in direction:
Deal with any remaining imbalances through addition – not subtraction.
If your P is high, add N.
Vis versa too: If N is high, add P.
This plays into the growth strategies of your corals, green algae and all the allies you need for a healthy tank.
It's not really possible to do harm with these additions – "worst case scenario" is an extra flush of green algae growth for your CUC.
"Subtraction" would just be all the common "artifical" nutrient reducers for phosphate and nitrate, including GFO, carbon dosing and the rest. They are tools that each have their uses, but they're best to stay away from for everyday use – especially when a tank is still maturing. It's possible to do harm with these tools.
If the algae is growing and the corals are growing, then the nitrates won't stay high for long. They go fast!!
Maybe just do some water changes?
Green algae grows and uses excess nutrients.
Herbivores mow it down and turn those nutrients into "stable organism".
(If you're missing the second step, then the nutrients wind up back into the water.)
Plus, all other algae are worse and almost nothing eats them.
Green is a win:win and the alternatives algae that will grow in its place are all lose:lose.
That's one possible reason – and the best one.
Is the wrasse still "on the prowl" BTW?
The tank is so new and has had issues, so it's pretty hard to point the finger in only one direction – but that is possible.
Nutrients = growth
Look at pH and oxygenation issues, or possibly nutrient deprivation to cause that.
High pH and oxygen saturation are two things that can actually slow down growth because the – they r e t a r d the coral's photosynthesis abilities. Under normal conditions, nutrients cannot do anything like this.
So perhaps boost P if needed....use that nitrate up. At most I'd do some water changes..but still have to watch that P doesn't dip too far or the remaining N will still be "stranded".