What is this? Came up overnight

[BlastedReefer]

So I checked my tank this morning when I got up, and there is almost a copper tint on one corner of the tank. This was not here yesterday. Its an 80 gal tank, two clownfish, watchman goby, lawnmower blenny, shrimps, crabs, GBTA and RBTA and a few corals.

I’m not sure what kind of lights, but I know they’re LED’s.

Alkalinity- 8dKH
Ammonia-0
Nitrate-trace, maybe 2mg/L
Nitrite-0

Just would like to know if this is some growth I need to get rid of? And why just in this one spot?

Any help would be appreciated.

 

[Crabs McJones]

Looks like it could be diatoms. How long has the tank been up and running?

 

[BlastedReefer]

Almost 4 years

 

[Crabs McJones]

Almost 4 years

Ok, have you added anything to the tank recently that could add to your bioload increasing your nutrients?

 

[BlastedReefer]

Well there goes the lightbulb lol
We tested our water last week and our nitrates were a little high. We realized we had some dead flow areas and rearranged the rocks. That made the nitrates read even higher so my husband went to the LFS and bought what they recommended. I attached the pictures here. I totally forgot about all of that. So I guess our nitrates are good and we shouldn’t be using this anymore?

Thanks so much for the help.

 

[BlastedReefer]

I think I replied wrong

 

[lzrlvr]

Do you ever stir the sand?

 

[BlastedReefer]

I vacuum once a week, but don’t stir the sand. Is that something I should be doing?

 

[saltyfilmfolks]

Well there goes the lightbulb lol
We tested our water last week and our nitrates were a little high. We realized we had some dead flow areas and rearranged the rocks. That made the nitrates read even higher so my husband went to the LFS and bought what they recommended. I attached the pictures here. I totally forgot about all of that. So I guess our nitrates are good and we shouldn’t be using this anymore?

Thanks so much for the help.

I would only dose one of those at first.
I’d choose the MB7.
I belive is has bacteria and a small carbon source in it.
So if you used both , you may have overdone it. The stuff in the sand could be a little brown algae or a small bacteria bloom. Both of those together could cause that.