Diatoms

Been dealing with unbalanced nutrients and trying to keep nitrates up . I thought I was just dealing with a dirty tank but idk if this is diatoms if you guys can help me out

Trying to id this stuff growing over my rock

Its balck / brown in color blows off easily with a feeding tub and sucks up easily during water changes

Can clean it off the rocks today and 2 days later its back ai and local reef pages ( in new zealand ) havent been much help any ideas

I'm getting a thin green film/algae layer over the sand bed, particularly toward the back and sides.

Looking for advice! Bought a used IM 120 gallon AIO tank from LFS. When we got tank, the inside glass was a bit foggy. LFS said fog would go away with water. We added water and things seemed ok until we turned lights on. Fog is definitely still there. This pic seems like where previous owner had his nori clip. Tried scraping it a bit. Nothing seemed to change.

Wondering if anyone knows how to clean it. Tank is newly cycled and I added fish from a smaller tank. Could move the fish back to smaller tank if I need to empty the 120. It would suck, but it will only get harder given more time.

So anyone have tricks to help? Either with water or without? Thanks yall!

Update- Firefish went in first, Bengaii and Pink Wrasse 2 weeks later due to stocking availability. All doing well so far. Update on Week 11-12 coming soon as that was my first panic disaster week!

Week 7-10 was more learning. First time drip acclimating a fish! Understanding consumption, local LFS mixed feedback and getting rid of diatoms. Hermits are not friends- one is enough. More than one is a bad idea! Shrimp are not to be feared if you acclimate properly and when you add pods make sure skimmers and wavemakers are off! 10 weeks in, 1 fish and a few corals. Definitely learning a lot!

1.5 weeks into cycling and we have diatoms!

Week 3 and 4! Diatoms everywhere! Massive KH drop forcing a mid cycle water change. Understanding KH and the role of KH/PH in cycling was a massive learning curve for me! Hopefully nitrites continue to drop to 0! Ammonia at 0! Should be cycled in a week or so!

Going on a little over a month and just got out of the uglies. Had a bunch of diatoms and maybe the smallest amount of cyano. Used my other two set ups to jump start this system and it seemed to work. Nutrients have been stable along with all other parameters and I have to say this tank loves to eat magnesium lol. All the lps seem to be loving this system for sure… thanks for looking and happy reefing my friends.

New tank 2 weeks old and Pretty sure this is just diatoms but any tips to make sure it goes away will be great!

New setup starting to come to life. I love this part. Setting up the building blocks for maturity. Waiting on these diatoms to burn out before I move over the sensitive corals, but I love the progress.