Red spots on live rock

[Dank_Reefer]

Hello, new reefer here. I’ve had my fluvalevo set up for about four days now. It’s a stock set up for now with an aquaTOP 50w Heater. When I bought my live rock from my local fish store, one piece had some red spots on it. I assumed it was dead algae but it now seems to be growing hairs. Does anyone know what it is? 

[seabass]

I can't really tell from the pics.  The "hairs" might just be algae.