New tank question...Fuzzy Brown rust appeared.

[sm66th]

So I have had my tank set up now about 3 weeks. 55gal w/ 40lbs LR & 70lbs substrate(sand/crushed coral) mix-20gal sump w/ Skimmer and chaeto. Non-stocked. I woke up this morning to find brown rusty colored "fuzzy" rock and substrate, nothing on glass. Water tests seem to be ok, not perfect, as I know my tank is still cycling. After a few searches, I have a bunch of opinions as to if this is good or bad and what I need to do. Some saying hurry quick your tank is going to be overrun and have to start over to others saying it fine and let it run its course. 2 different extremes there. My initial thought is its just part of setting a new tank up to mature, but this is my first SW tank so I am fairly open to those that have done this before. Any thoughts from the experienced folks here that could help? Should I look into "cleaner crew" shortly or continue to let it be? Thanks in advance.

 

[btkrausen]

Likely just diatoms, which will generally appear, then disappear, during a tank cycle.

 

[dsmhero]

^ +1 agreed. They will eventually go away.

 

[BarbH]

Agree with the above on diatoms, if you want to post a picture would help to verify. Nothing to worry about common in a new tank

 

[wysiwyg]

as stated above nothing to concern yourself with pics can make it 100%verified though

 

[sm66th]

Thanks all, will grab some pics after work and post.

 

[sm66th]

Here are a couple photos I was able to get this morning.

 

[Reef Breeders]

Diatoms for sure, they will go away. Have you considered different rock? The rocks should be porous calcium carbonate rocks, they will have much more area for filtration.

 

[sm66th]

Thanks for verifying. Yes more rock is to come, just bills come first, so next week plan is to pick up some different types. These were a start at a good price.