Help with algea

[John76]

Hi all , having a problem with algea I have a 80 gallon spliced with a 20 gallon frag tank, issue is I'm getting green and hair algea in the frag tank I was wondering if there is a way to trick it to grow in my sump by adding a light

 

[Spartanwarrior]

A chaeto reactor or refugium can outcompete other algaes in your tank...u dont want hair algae in the sump it will just travel everywhere again.
If just in a frag tank consider dosing hydrogen peroxide and move your frags to the main display until remedied

 

[Actinic Atoll]

If I was going to try growing algae in a a sump or anywhere else, I might be tempted to buy or DIY something like this. SURF2 or SURF2x floating surface Ribbon Scrubber with Green Grabber surfaces - 2 cubes feeding per day

They have larger and smaller sizes, rated by how many cubes of frozen you feed in a day, pretty neat. Which One?

Or you can make a "reactor" shaped one with a pump etc.
I'm kinda attracted to these Santa Monica filters for their form factor and simplicity. They are just foam, LED and air pump. Most models to a fairly good job at keeping the light containted

I don't have an algae problem, but like anyone else I'm constantly knocking down nitrate one way or the other. One day I may give algae scrubbing a try.