Hair algae problem

[Dale D]

That may be alittle too often. But, a 5 gallon a week water change on a 80 gallon predator tank is not alot.

What do you have for substrate. A substrate that is made up of too course of material will have alot of void space between the pieces and trap alot of junk that will break down and become algea food if it is not syphoned out.