Need some help whT to do?

[The_Barrs_Reef]

pretty new tank 120gal. ran for about a month for cycle and been running about a month with everything moved over from my 30 gal tank. As of last week my rocks and sand have been getting brown. Daily I've had to stir up the sand bed and clean rocks, what should I do to fix this?
The brown on the sand up against the glass also looks somewhat slimey photos below any help would be great. Just did a water change yesterday.

 

[andrewey]

It's probably diatoms. It could be some other organisms such as cyanobacteria or dinos, but given your story and the age of the tank, diatoms are a safe assumption. They'll likely go away on their own, so no need to blow them off the rock/stir the sand. I would just wait and you should notice most are gone within a month or so. If they are covering the corals or you notice anything dying, then it's worth intervening and there are ways to investigate if it's another organism.

The slimey stuff is likely a mix of algaes and diatoms. The new tank is a pretty volatile environment. It just needs to settle out.

 

[The_Barrs_Reef]

It's probably diatoms. It could be some other organisms such as cyanobacteria or dinos, but given your story and the age of the tank, diatoms are a safe assumption. They'll likely go away on their own, so no need to blow them off the rock/stir the sand. I would just wait and you should notice most are gone within a month or so. If they are covering the corals or you notice anything dying, then it's worth intervening and there are ways to investigate if it's another organism.

The slimey stuff is likely a mix of algaes and diatoms. The new tank is a pretty volatile environment. It just needs to settle out.

Thats a huge help thanks all fish and coral seem fine