WHAT is this?!

[1MJG1]

I've had the tank set up now for close to a year and recently i haven't been able to kick this green/brown algae on the sand that happens everyday! i clean it, suck it out, mix it etc. still comes back everyday. anyone recognize it?
45 Gal mix reef
phos=0
nit=0
Ca=430
Mg=1600
kh=9.5
Red sea salt and red sea coral color supplement.
Tried a bottle of vibrant aqua cleaner that everyone has been raving about on reef2reef....didnt do anything for my tank.

super mixed reef
1 sixline wrasse
4 clownfish
2 blennies
1 foxflame
skimmer run @ max 24/7
0 TDS water
phos/ban reactor
everything else stable

 

[Diesel]

Looks like diatom to me.

phos=0
nit=0

Nit is Nitrate right?
With these both at 0.0 you starving your bacteria in your tank that in their turn will take care of the algae.
Your tank looks awesome btw,
Can you tell me what test kits you're using?

 

[1MJG1]

Looks like diatom to me.

phos=0
nit=0

Nit is Nitrate right?
With these both at 0.0 you starving your bacteria in your tank that in their turn will take care of the algae.
Your tank looks awesome btw,
Can you tell me what test kits you're using?

yeah nitrate....maybe its just cycling again or something. i do 10gal water changes every week since i had a bryopsis outbreak a month ago so i raised my Mag to 1900+ for a month using tech M. all the bryopsis algae died with no coral or fish effects...(maybe lost a blue leg crab or 2) but ever since all that went away my sand has been super dirty like this. i use all Red Sea test kits.

 

[1MJG1]

sorry for the poor pic quality just my iphone7

 

[saltyhog]

Water changes always seemed to fuel my diatom problems. That said, that doesn't really look like diatoms to me. Mine were more evenly distributed on the sand, not in round blotches like that. Any new live or dry rock added recently?

 

[1MJG1]

Water changes always seemed to fuel my diatom problems. That said, that doesn't really look like diatoms to me. Mine were more evenly distributed on the sand, not in round blotches like that. Any new live or dry rock added recently?

nope nothing new added.