I am certain my snails eat the poop in the tank, as it’s been set up for 6 months now and there is no trace of poop anywhere. I’ve never seen this is any of my tanks, over many decades. This is my first saltwater tank.
When I added my tail spot blenny, there was a lot of accumulation, as this little guy is a poop machine. But a few days later, it was all gone.
I have a trochus snail, a few nerites and 1 nassarius snail but if I had to bet, I would say the nassarius is doing all the work.
So if you don’t have any nassarius snails, definitely get some !