Help with sps!

[Emeraude1484]

My 90galDT 20galsump has been running for 2yrs. Had ushio 2x250w 10000k + 2t5s til about 3 weeks ago switched to 2x250w xm20000k same t5s. Running gfo, Tunze 9005 skimmer, dsb and refugium. Have had ongoing bubble algea issues. Growth has been good in sps and clams. fairly slow in lps, zoas.

Lately, cyano has been wreaking havoc, choking the spsfrom the bottom up. the pink birdsnest doesn't look like it'll make it. My clams are also showing signs of stress I'm thinking might be pinched mantle but with everything else I don't want to assume and stress them more unecessarily.

The only GOOD polyp extension I ever get is with the Yellow birdnest.

Went through 3 days no lights cyano was still strong as was the valonia. Decided to scrape every inch of bubble/cyano I could get to and do a 30gal water change on Saturday.

The parameters today with new API tests:
Ammonia: undetectable
Nitrite: undetectable
Nitrate: 0-0.2
Phosphate: undetectable
Calcium: 360
Salinity: 1.022

Only have 2 clowns, 1 firefish, 1 mandy (finally felt I had enough to sustain his diet) and a yellow watchman.

What do you suggest to get these corals to stabilize again and colour up? I would like to add more colourful pieces of sps and chalices but not until these show better signs....





Parameters: last night
Specific Grav (with recalibrated refractometer) 1.025
PH: 8.2
Ammonia:0
Nitrite:0
Nitrate:0
Phosphate:0 (asking LFS to do a test)
DKH:9
Calcium:420

Waiting for mag test to arrive at LFS tomorrow and planning to start balling method dosing.

This is after scrapping all the bubble possible.