Ugly stage or worse???

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Not ugly stage. That’s dinos.
 
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i had used chemiclean for this issues before. i would dose 20% less than recommended and run for 24 hours or less. Turn off GFO & carbon and remove skimmer lid. it will overflow the skimmer. If is my tank, i would do this......every tank is different.
 
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The cup test method for dino:

you'll need to siphon some algae into a container preferably with a lid or cap. After filling up the container shake the water up vigorously to break up the algae. Then filter the water through a paper towel or filter sock, the water should be rather clear. Leave the water exposed to ambient light in this container for 30-120 minutes. In my experience dinoflagellate algae will be the only type that aggregates back together quickly in the container

Dino will disperse in the container completely after being shaken and will pass through the filter almost completely with only detritus remaining in the filter. Once the filtered water has been left sitting in ambient light for about an hour they will organize back together into their typical slimy appearance.

Cyanobacteria will typically stay matted together even after shaking the capped container vigorously with lots of small bits resembling torn paper. Most of the algae will be caught in the filter with the detritus but the filtered water will still be discolored. The algae will not organize back into colonies after an hour. The water tends to stay brown but sometimes the cyano settles on the bottom of the container.

Diatoms will disperse much more than cyano when shaken vigorously into a brownish tint but sometimes tiny bits stay together like the cyano. Much more of the diatoms will pass the filter compared to the cyano. The diatoms will not reorganize after the filter and they tend to be more negatively buoyant than the cyano or dinos so they settle on the bottom of the container faster.

Did the test and it is dinos. I'm manually removing as much as I can. Gonna stop my fuge and skimmer. Do a 3 day blackout and feed a little heavy. Try to get my nitrates to 5ish.
 
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Dinos - wish I could say that I was not an expert, but battled them twice before learning about nutrient management (not too low) and the importance of a diverse eco system. Starting with Dry Rock and then trying to battle the uglies by reducing nutrients seems to be the recipe.
 

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