thanx all for the replies. i am using the nova pro 6x54w over a 72 bow. yes, it is a hector goby. i hv 3 of them in there. they eat nothing but hair algae, since i hv a little bit in my tank. the calcium and coraline algae r maintained through weekly water change, and occasional calcium supplement. and yes tom brady is out! lets go jets! boo belicheat.