Issue with Goni?

[Long Island Reefer]

Not sure if my fish or inverts are causing this issue but for the past 2-3 weeks my go I’d have been fairly closed up(not completely closed but no where near the extension I was getting) and the tips on some of the polyps seem to be gone. Do gonis lose their tips or is something in the tank eating them. At first it was only happening to my ecc burning man but now seems to be effecting my amazeballs also. Any help would be appreciated.
Before and after pics attached.

 

[Long Island Reefer]

Water Parameters:
Salinity:1.0248
Nitrate: 3ppm
Nitrite: 0ppm
Ammonia: 0 ppm
Phosphate: 0.07
All: 7.6
Temp: 77.6
Ph 8.1

 

[Long Island Reefer]

Ran an icp test recently and nothing to crazy from the results I feel like:

aluminum is a highish: 52ug/l set point is 0-60ug/l
Iron is high 15ug/l set point is 0ug/l

some other dosing elements it recommends due to lower levels: potassium, iodine, boron,

 

[Long Island Reefer]

bump for still being stumped on this one?