Rusty Algae

[jimandlu]

we've had a salt water tank for 2 years now and for about 3 months now we've been getting a rust colored algae. the fish seem to be fine it just looks really bad. the water seems to healthy except the water is hard that we use. any suggestions would be appreciated. thanks jim and lu

 

[kkyyllee]

could be cyano

is it slimy looking?

 

[jimandlu]

no it doesn't appear to be slimy looking