Help with my tank
 

I have a small saltwater tank and I got this brown looking fungus all over it. I went to petco and they told me I need a ton of cleaners such as snails, hermit crabs and stuff like that. well I got some but they haven't done any thing and I wanted to know is there any chemicals to get rid of it or should I do a partical water change?

This is a loaded question and it will require a much more in depth post for us to help out. We need a complete description of the tank, in detail. Everything from bottom to top, sand depth to lighting to livestock. Include history and water parameters. Pictures would be EXTREMELY helpful.