Agree with everyone it's a bacteria bloom snotty slimy crap , and it will pass, slowly but will go away on its own. I just went thru it. New tank myself prob 2 months in and my tank is a little cloudy still but no more snot on rocks or sump. Give it time. And if down the road it keeps coming back and tank still cloudy add a UV sterilizer, there are a couple thread on here about it.