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I looked at the first photo as large as I can get it.
Are the bubbles attached to the red substance, it appears so?
the stuff on the top of the rock on the right hand side does look like DINO
kind of stringy with bubbles.
Might try bumping up the phosphates a hair.
 

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What I am basing the thoughts of Dino on is the first photo you posted.
In the upper right hand corner of the photo the rock comes from the side of the photo and curves up.
After a bit it makes a sharper climb toward the top of the photo. Just to the right of where the rock sharply curves up there appears to be bubbles attached to stringy appendages of the red stuff. Is this correct?
If it is dino you may just need to raise your phosphate a little.
The phosphate will allow the algae to out compete the Dino.
So I would remove any phosphate control you have, leave in any nitrate reduction that you want to.
If the phosphate gets too high then you can judiciously re-intoduce phosphate control.
 

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The only way you could have recurring diatoms if you are not adding silicates to the system is if some how the diatom shells were being broken down in the system and returning to the water column.
Doesn't happen often but I seem to remember an occurrence of this. Don't remember the cause though.
If I am correct about the stringy stuff with bubbles I would still think Dino.
 

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I have never used uv but it can be very beneficial. I just never had the extra cash.
I don’t know if uv will help a lot with dino an algal turf scrubber might help more giving algae a place to colonize.
I know matt and I believe hack went through dino.
 
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