Door open, skimmer spazzed

[ImaFlippinDolphin]

So, I had someone leave my garage door open(door to basement where tank is located) and my skimmer went into overdrive...anyone know why? My ph is 8.15 I didn't think there's too much co2...maybe a massive fish turd hit simultaneously...I dunno. Any insight is appreciated

 

[fishguy242]

hi, poss dust blew in settled on top of water ,surface skimmed ,skimmer removing?