I put 9 scoops resolved in water the first day. After 2 days I added 7 more scoops yesterday. Its a 90g tank. If anything it is growing. No I do not dose carbon or nopox. I'm thinking about adding a phosphate reactor and a bio pellets reactor to keep my nitrates and phosphates down.
I would not nuke the tank, I would dose Aquaforest Np pro and pro bio s. one thing is have not read is were are your No3's and Po4's. I agree with @saltyfilmfolks your could also try NoPox.
I feed frozen brine shrimp and omega one marine pellets and coral frenzy every now and then. I have not done a water change since the treatment and yes the latest pics are after the treatment. Nitrite was 25 and po was 1. I know that's high. I do a 10g water change weekly and monthly I do a 25g. It is a thin hairy film on top of the sand and rocks. At some times it looks blue and green but now it looks black.