Help identify algae/bacteria on sand bed

[Noobreefer84]

I was hoping to get some advice on what is on my sand bed. As well as what to do about it, if anything.

Couple things to note.
I just siphoned out my Fiji Pink sand cause my flow had it blowing all over. So it is now Caribsea Special Grade.

My nutrients bottomed out mostly likely because of replacing the sand.

Was:
Alk: 8.6
Cal: 520
Mag: 1140
Phos: 0.00
Nitrate: 0.00

Fixed/adjusted today:
Alk: 9
Cal: 400 (slightly reduced daily dosing)
Mag: 1350 (dosed)
Phos: somewhere between 0 and 0.25 (need a better tester)
Nitrate: 4.6 (dosed brightwell)

I’m going to continue testing nitrate every 3 days and dose as needed until I get it stabilized. I have increased feeding as of 2 days ago.

Not sure if the image below is just algae or bacteria from my nutirents hitting zero.

 

[Kingsley_Reef]

How old has the system been up?

New Sand Ile bet it’s just diatoms

 

[Noobreefer84]

System was set up early oct. Sand changed out. Dec 26. I haven’t hit an ugly stage yet since I set it up. But I did move over a bunch of bio blocks from a 4 year old tanks sump and they are in my rear chamber. So it’s probably prolonged the uglies a bit longer than normal.

 

[Cichlid Dad]

System was set up early oct. Sand changed out. Dec 26. I haven’t hit an ugly stage yet since I set it up. But I did move over a bunch of bio blocks from a 4 year old tanks sump and they are in my rear chamber. So it’s probably prolonged the uglies a bit longer than normal.

Welcome to the ugly stage

 

[Noobreefer84]

Welcome to the ugly stage

Haha thanks. Happy to be here

 

[Kingsley_Reef]

yeah your there I wouldn’t worry about chasing your parameters quit dosing let it do its thing keep a eye on your phosphate for now and maintain with regular water changes