NEED HELP STAT!

I thought my tank was going well but for a couple of months now I just can't seem to get rid of this algea on my sand and the hair algea on my tank walls. My tank has been setup for about a year and a half. I've tested my water myself and had it tested at the local "saltwater warehouse" in Dayton and it falls within parameters. I've done numerous water changes usually every fortnight. ...

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