how do I clean this nasty stuff

snails and more frequent water changes

+1

Time and TLC

snails, hermits, shrimps,

Like mentioned on other pics this is a new set up and my first ever saltwater tank I did do a partial water change I have a few hermits and a single snail but the hermits seem to clean each other more than my tank

More of a clean up crew.

you can scrape the crap off of the back wall with a razor blade during a water change

I did clean it up some just didnt want to over do it. Don't know whats too much as far as cleaning. I did post a pic of what it looks like today thats after I cleaned a little.

get turbo snails i got them and within 2 days they ate up a lotta algae.