Grow tent suction = less air for plants?

I have a 5x9 tent. When I turn the exhaust fan's speed up, the tent sucks inward. With the exhaust fan at full speed sucking a lot of air out of the tent constantly, does that mean there is less air for the plants inside? Is it suffocating them at all?

No. There's air coming in still. Or your tent is about to implode.

It means you are getting more not less fresh air. I hope you have at least some kind of passive intake duct rigged up? Put your hand near the intake you will feel the air moving in...

I had that happening so i opened tbe flaps for more air since my room is dark it didn't matter to open them.

Um airflow is NEVER a bad thing unless its wrought bu a hurricane or heavy storm imho. negative pressure can be balanced by opening a vent or valve in your tent good sir. However imho neg pressure(it sucking inwards on itself) makes me smile!