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Out of curiosity what kind of rock you using?
How much Nopox are you using?
Yeah, looks like O. ovata; good luck managing itNew tank just over 1 month old. So not terribly concerned.
Got some stringies so pulled out the microscope.
Ostreopsis?
I used dry Marco rock as well and got Ostreopsis around the 4 month mark or so. NO3 and PO4 were plummeting for me as well and dosing NeoPhos and NeoNitro could barely keep up with it. UV sterilizer along with increasing nutrient levels got rid of them for me (but mainly the UV I think). Went from seeing only dinos under the scope, to a mix of diatoms, some cyano, and a few dinos (not Ostreopsis) in less than a week.
How did this work for you?Update: approximately 5-6 days into running a UV sterilizer over night, cleaning the rock daily, changing filter floss daily, overfeeding, and dosing Nitrate and Phosphate (still bringing those numbers up approx 2ppm nitrate and just over 0.05ppm phos), the dino population seems to be steadily decreasing each day, rock doesn't appear as "snotty" and is turning green, any strings are a fraction of their size and much less of them, and a couple zoas I pulled from another tank seem much happier. Once they seem to be all but on their last legs, I'm going to add some copepods and will add a piece of LR from my other tanks sump to help spread biodiversity in this tank as I'm sure thats a huge factor in this problem.
End result I'm fine with Cyano and algae blooms, as long as these things are pushed back into the oblivion they belong in.