Sounds much like the problem I was battling with some dino and ordered some Fauna Marin Algae X which I will be picking up today from my mailbox in US. This apparently kills all algae - less cyano.
Now I was starting to have a little dino growinig due to the elevated heat which struck at the beginning of July and since my AC unit was on backorder (everyone was sold out) and also I think my acclimation period was just finished and Radions were running at 100% which didn't help the situation.
After much reading I decided to do a lights out three day period and see how this goes before starting to dose (personally I hate dosing as it could potentially cause more issues down the road). At first I was skeptical about this method, but decided to go on and try it before dosing and I have to say every coral survived including three anemone's (I think the corals actually liked). I started the lights back up on acclimation mode from 55% and set it to a max of 90% over the next 4 weeks and everything seems fine.
I had a little dino which dissipated (have to see if this stuff comes back as it can grow over night) but seems clear so far.
Also I had a little cyano due to a large strawberry top hat snail rotting in the tank (I dont think they like 85-86 temperatures) and my sand is nice and clean now.
I can update you with any changes, if there are any, however if it worsens I will most likely start the Fauna Marin Algae X (people seem to have had huge success with it).
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Casual reefer
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