"I've started to use GFO fairly recently, primarily because my phosphates were climbing past 0.2, but even then my nitrates were zero"
it took me 2.5 years to get my nitrates in the reliably detectable range. So take it slow. An autofeeder really helps. And yes, this route will lead to cyano and with the proper flow and clean up crew it will balance out.
I am in the process of adjusting my feeding now because as the fish get bigger so does their nitrate output. I can finally have cheato. It always died when I had no nitrates. I am hoping that adjusting my feeding, adding cheato, turning up the skimmer will all balance it out. I can always step up my carbon dosing. But my tank looks good now and getting better. So as long as my nitrates are not climbing, and there are no algae issues I will just keep doing what I am doing...
Be mindful of dosing off the shelf products in an effort to color up. Amino acids and Pohls (Zeovite) extra are great but in young tanks overdosing is easy and then potential algae problems. Good feeding, good husbandry and don't underestimate your need for a good diverse clean up crew and everything will color up well. Takes MONTHS...
cool tank dude! how the hell do you keep your back wall that clean?!
This may be part of your problem. If you dropped your phosphates to quickly, it would wash out your sps and they may need to ajust.
Also, you may want to try mixing some pohls extra in to your amino acid dosing schedule. Its a bit more potent that the acropower imo.
You could try adding a good ol' fashion wet/dry filter to the system to pull up the n..
A simple canister filled with bioballs and a pump trickling water over them would probably do it...
However, you have a GREAT looking tank, with time, the n will probably creep up on its own- especially if you plan to add more fish.
Maybe simple patience is the key...
I really don't think excess light is an issue at all..
Nice job!
no offense but from the FTS it looks like the powder blue may be a bit 'boney'. may want to give consideration to less pellet feeding and more frozen/strained feeding. fatter fish, more activity, respiration, fish waste and your NO3 should happen very easily very naturally, if anything keeping NO3 low I imagine would be more of a challenge than raising it slightly.
I'm in a similar boat trying to obtain deep/rich colors.
honestly i'd say your system looks healthy aside (you take nice pictures). perhaps your choice of bulbs is less common than the B+, P+, C+ route which gives an appropriate spectrum according to most.
in my SPS Frag Tank w/3 fish i've been dosing lugols (iodine, iodate, iodide, potassium) and brightwells aminos' daily to my SPS frag tank (broadcast feed not target). approx 30 days in routine and some improvements. my parameters are fairly stable, 440 Ca, 11.2 dKH, 2ppm NO3, 1250 Mg, 0 ppb (Hannah ULR Phosphorous) I will also on occaision CoralRx pieces that look a little off - but for me this is still a frag grow out so pulling a piece on a plug is simple, whereas in your DT dipping is a bit more involved. some respond well to the CoralRx, others i won't dip.
keep good flow in tank and in sump.
i might suggest getting your colors more brown, then hope in time the deep/rich color you are after emerge.
either way i don't think you can find a "Here's the solution" response, but more likely ideas to help. i might suggest avoiding suggestions telling you you are doing it all wrong.
what 'coral specific' foods are you using?
will subscribe, keep posting.
I would consider removing the gfo. You said you added it because your phosphates climbed over 0.02? People spend to much time chasing numbers when in comes to phosphate IMO.