First SW tank please help!

Alfredo05

Feeder Fish
MFK Member
May 24, 2013
55
0
0
new jersey
image.jpgJust wondering what those stain onnmy glass were??? They appeared after puting my sand in there i took the sand out cleaned it some more cleaned my tank again put it back in and the stains are back. They are on everything that i put in the tank, i want to kno what it is and how do you get rid of it. I think its from the sand but idk because i cleaned it n and put everything back in trying not to stir the sand but still, and my salinity is between 22 and 24. gravity is just above 1.016 will be that be good for a fowlr tank? Thanks guys!

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