Fighting Diatoms or cyno on my sand!!

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BanZI29

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I have been fighting this algae in my tank for about a month now. I can not get the stuff to go away!! My Tank is 3 years old and very established. Here are my stats as of yesterday:

Ph = 8.1
Salinity = 1.025
ammonia = 0
Nitrite = 0
Nitrate = 4.1 (hanna)
Phos = 0 (hanna) never been 0 before. Always has been about .160
Calcium = 520 (redsea)
Mag = 1240 (Aquaforest)
30% water change 2 weeks ago
Salt = Fritz blue box. ( always have)
Dosing: All for reef 18mL daily, Calcium2 mL daily, Brightwell Restor ( for 2 weeks not 5 mL every 2 days)

I just changed my 5 stage RO system filters 2 weeks ago, and my DI resin 2 months ago. TDS is O
I have a skimmer and running Chemipure blue in a reactor. No chaeto anymore ( it died off)
I can not keep a goby alive either. I have gone thru 3 in the last couple months. you can see what I have in my tank in the pix.
also weird, my cat's eye zoas are not opening all the way now for the last couple weeks (open in the picture thou, that was a month ago), along with my alveopora's not being happy and coming out but, my goni's are ok. all the others seem ok though. nice and big. ( the pix are from before I got the alveo's)
PLEASE any help or suggestions are really appreciated.
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BanZI29

BanZI29

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You need some phospahate so other bacteria can out compete
yea for some reason my phos dropped to 0. it used to run high, but everyone was happy. I turned off my skimmer for the time being, see if I can get it back up .
 
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BanZI29

BanZI29

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Get your nitrates and po4 up.. that will help all the corals.. I can barely see the sand bed so I can’t help you there.. close up pics would help
getting that up seems to be the hard part. I turned off my skimmer and fed a little more but. the levels are the same 3 days later.
 
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