ID needed - diatoms/dinos/???

[DanH86]

I’ve had a brown algae slowly forming over the last couple of weeks and am getting concerned that it might be early stage dinos. identification help would be much appreciated.

Notes:
Tank is 4 months old, not had an ugly stage yet.
The brown algae grows first on the powerheads and areas of rock that are nearest the powerheads - high flow areas. It’ll coat a powerhead in 1 day.
It has started to appear on the sand bed recently.
My clown loves to eat it.
No dead snails/fish
Doesn’t seem slimy, can be blown off with a baster but can then form long strings
Seems to be in a web like coating over the rocks giving them the appearance of being covered in a brown spider web until disturbed.
Small air bubbles can be present on some areas
Dies off overnight with lights off
nitrate = 2ppm, phos = 0.0
10% weekly water change using 0tds RODI and Red Sea coral pro salt

My searching seems it doesn’t entirely fit the bill for either diatoms or dinos...I am heavily overfeeding to tray and raise phos, I wonder if this is neither diatoms or dino and simply the result of too much food?

After disturbance, note the web like appearance on the left of the rock:

 

[ndrwater]

Looks like typical Diatoms.
Dino's are slimy looking with the telltale bubbles at the end of a "snot looking" string..

 

[DanH86]

Thanks, you’re easing my worry.

If I disturb the algae I can cause it to become the string with a bubble on the end, but it doesn’t appear to be happening naturally...

 

[ndrwater]

Thanks, you’re easing my worry.

If I disturb the algae I can cause it to become the string with a bubble on the end, but it doesn’t appear to be happening naturally...

Still sounds like typical Diatoms. Just part of the normal cycling process.
Diatoms are something we all deal with. Usually with time, things settle down, but there is a reason EVERYONE has an algae scrubber for their tank glass. A good way to help combat Diatoms are snails and tangs... There are lots of fish we keep in our tanks that have jobs. Tangs and snails are just the tip of the iceberg.

 

[DanH86]

Excellent, I will ride it out and up the cleanup crew because I don’t think it’s as big as it should be...8 trochus, 2 nassarius, 2 red hermit crabs.