Long fine brown algae?

Deltec

carnthetiges

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Hoping someone's able to ID this algae for me.
Only noticed it after moving some of my corals around. The leather in the attached pic has long fine strands of brown algae.
Worry it's the dreaded dinos but i couldn't find any similar pics - most pics i've found has it appearing thinker, gunky and with air bubbles. Maybe this is early stages?
I've only noticed on coral. Mostly this leather and a couple of strands on a neighboring zoa colony and a sinularia.

leather algae.jpg

Tanks is 15g, 5 months old.
There's a clown and a dottyback, plus this leather, some sinularia, zoas, mushrooms and an elegance.

26 degree C
Ammonia & nitrite: 0
Nitrate recently went down to 0
Don't has a phosphate test kit
dKh: 7.5 slowly working up to 9ish
Running the following lighting schedule

Cheers
 
Fritz
Deltec

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