Chaeto strings in display?

[ribs]

I keep getting stiff single-strand pieces of algae that are implanted in the rock in the main display, takes a pinch real close to the base to remove it.
I've left it for up to a week, the single strand will grow like 2 feet in that time.
Is this chaeto planting itself in my main display (there's some in my fuge with red gracilaria), and if so how could I prevent it? Would this be from pieces floating into the display, hooking on a rock, and taking off from there? It's not a nuisance, but the strings get pretty long pretty quickly. Right now, there's about three of these strands growing at various lengths in various spots.
Thanks.

 

[Phoneguy982]

LOL......I just noticed the same thing in my tank this past weekend. I've got a bunch of chaeto in fuge area and figured a piece rooted in my rock in the main tank.

 

[foob]

You will have to improve the separation between your fuge and return pump. More baffles, slower water flow, sponge filter at return pump intake will help.

 

[ribs]

ya think it's chaeto taking root in the main tank then?
I did not expect this result