Red hair algae and red branch like algae

[Coralgurl]

As title says, I've got red hair algae and red branch like algae growing on my older lr. My sand is clean, it's not cyano. It's not everywhere but it is getting long. I've tried looking on the web but not finding anything. Can post pics later, but any ideas and is it a problem? My blenny, snails and crabs don't touch it. Thanks.