https://www.reef2reef.com/threads/bacterial-imbalance.712977/
we are about to see how badly he wants his reef fixed, its like yours even though pics haven't been updated yet.
its all about the size of the reef, his is 20
20 gallons means full access
full access means can fix, overnite. deliberately fixed. patterns
200 gallons might not can be taken apart and cleaned...we'd test for every param under the sun, order a bunch of additives to see what might work without for-sure test modeling, we'd add new animals (bioloading) to hopefully eat the invader, total unsurety would follow.
small reefs never have to put up with all that. I dont think there is a single pico reef running online who has dinos or cyano issues, they practice early strict guidance (the smaller the reef, the easier full access guiding)