New Reefer - Spots in tank?

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LOZReefer

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Hello all! New reefer here.

My tank is 5 weeks old. Started with dry rock and live sand - tank has been cycled for about 3 weeks. I've added 4 fish (2 cardinals, 2 clowns) and don't have cleanup crew yet because I haven't had algae growth or anything yet and my LFS is currently out. I've got a couple frags of GSP and some Zoas. My lights are just cheapo CurrentUSA lights, that run for approximately 10hrs a day - these will be switched out soon. My wavemakers are also cheap CurrentUSA pumps, but the flow seems to be okay for the most part. I do have a protein skimmer that I haven't added yet but can add at any time if I need to.

Here are the numbers (Nitrite and Nitrate are tested with the API master kit so take it for what it's worth, everything else is Hanna checkers).

150 gallons (120 DT, 30 Sump)
Temp 78*
Salinity 1.025
Ammonia 0.05
Nitrite 0.00
Nitrate 5.00
Ph 8.0
Alk 7.8

About 2 days ago I noticed I've got some brown buildup on a couple frags of Zoas that were cut and introduced to my tank about 3-4 days ago. I took the frags out and blew them off with a pipette, dipped them and returned them to the tank. One singular SBB head seems to be doing okay, but the Utters don't look like they'll make it. It looked similar to BJD - but I don't believe Zoas are susceptible to this as far as I have learnt in my research. It looks like it has spread to the rock and substrate now. Seems like it might be photosynthetic as the spots are lighter in the morning and start to darken up after the lights have been on for a little. I noticed today that they are starting to collect some tiny bubbles on them as well.

Any ideas on what it is and the steps moving forward? My thought process was to just let it ride as some of these things are expected in the early stages of the tank. I plan to maybe go to a franchise pet store to pick up some crabs/snails - would this be recommended? Tank is pretty spotless other than these red/brown spots (see pics). I appreciate anyone's input!!

IMG_3248.png IMG_3247.png IMG_3246.png IMG_3245.png
 
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Here is what the Zoa was looking like before I attempted to clean it.
 

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Update: Got some Hermits yesterday evening and pretty much overnight they completely cleared the tank of these spots.
 

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Looks like diatoms, totally expected for a new reef and they'll work their way out once the silicates are consumed.

I would recommend you add phosphate to your testing procedure. Very important that phosphate stays above 0 during the ugly stages. I wouldn't worry about what you're seeing on this post; your tank is going to go through plenty of different stages before it matures.
 
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Looks like diatoms, totally expected for a new reef and they'll work their way out once the silicates are consumed.

I would recommend you add phosphate to your testing procedure. Very important that phosphate stays above 0 during the ugly stages. I wouldn't worry about what you're seeing on this post; your tank is going to go through plenty of different stages before it matures.
I'd agree based just on coloration and the odds. You'll go through an ugly stage that should start with diatoms and, once your system's silicate is burned through, will be replaced with dinos. Silicate is used in cell wall synthesis with diatoms. The only way to really be sure would be to put a sample under a microscope and look at morphology.
 
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