Although I’m not sure of genus, this is a sign of using high quality live rock actually, the kind with a very diverse bacterial complement, real live rock is usually the only kind featuring that webbed invasion. Not common in dry rock setups at all
This invader is very reef like, this is what rocks look like while diving, this is periphyton group Santa Monica is always describing in his algae turf scrubber posts. Though it’s not a plant it’s still part of the life forms on the reef that uptake wastes into biomass, and then some matched grazer exists to feed on it and turns it into different biomass. This is a hitchhiker problem, not a chemical problem or nutrient issue.
If you want it fixed, rip clean your tank using a full take down, external cleaning of rocks in jetted saltwater and scrubbed off and a fully rinsed sandbed all put back together skip cycle style
We have threads collecting the practice all in one place
Let’s do a rip clean
That looks like a ton of serupulid worm castings but lightly coated in periphyton
Even though the pics don’t pan out much, this appears to be a high detritus system owing to macro pic details. We should make it cloudless and invaded free and keep the purple rocks underneath
