Few simple questions in regards to my setup, any answers would be great!

Whats up all
I currently have 5, 3 week old plants in a 3x3x5 grow tent. I keep a fan in there as well. Since they are starting to take off with growth my question is would it be ok to leave the door open while the light is on so that I can keep the fan outside the tent but still blowing on my plants? The fan is right up on my plants at this point and pretty soon there will be no room for it in there. Will the door open effect the lighting going to the plants or effect growth or will that be fine?

Letting some heat out and improving air curculation will improve the plants growth. you'll have one side open that won't be reflecting back light but that won't matter much.

^^^^^^agreed Side reflection adds a little, but excess heat takes away much more.

Peace and Great Grows

Asmallvoice