I would suggest trying just rinsing socks with a hose. When I change socks I fill a small bucket w water an some peroxide and rinse in the yard.I know. There is zero coralline.
I do lightly stir up the sand during weekly water changes.
There are 12 cerith snails and a tuxedo urchin.
I've cut back with the lighting schedule due to the algae, but I think I'll start extending it. Also the total photoperiod is 8 am to 10 pm. Just 5 hrs are at 75%, the rest are ramping up and down.
I wash the filter socks in the washer. No bleach
It just feels like there's a contamination.