I'm gonna give it a manual scrub. If it worked for my club member with a 400g tank and like 500lbs of rock, it can work in a 50 cube with like 12lbs of rock
I went with the elbow grease option over dosing as well in fear of complications down stream cuz of it.
Did a big water change into a rubbermaid container. Removed all corals to sand bed, and worked my way across the tank 2 rocks at a time. Scrubbed the f out of every nook and cranny, rinsed thoroughly, and replaced.
3 hours for me with 120lbs of rock. It should only take u 1 hour max.
Knocked it way back.
Decreased my whites from 28% to under 18% on my hydra26hds. And overall up time down 2 hours.
Then I increased chaeto fuge lighting from 12 to 15hours. Cut feeding in half, stopped amino acid and reef roids for 2 weeks and I have a few pockets left, but it appears the lack of nutrients in the water column, and lowered lighting combined with everything else all at once stopped it dead in its tracks.
Next week I've got a 5" starry blenny coming out of QT... he will take care of what's left I'm sure.
Lemme know how you went about it and I'm curious to see if u manage the same success as me. Good luck, be ready for some jello arms.