Dont even speak thru the door , once you speak to a cop then you've put yourself & the cop in a position where he can ORDER you to open the door without a warrant , your best off chilling on the sofa quietly till they split .
Never talk with a cop thru the door , they dont come with good news its allways bad shit so let them beat on the door , if they have legal cause to enter without consent their comming in anyway , if they dont you just took away their ability to say they smell pot or see illegal shit & force entry .
Unless YOU called the police & are prepared for them to eyeball the contents of your home never answer the door or speak with them thru the door , if they want you there is nothing you can say to talk your way out of going to jail & the door is comming down,on the other hand there are legal precidents where time is your best friend & police only have so long to question or charge you ,by avoiding all contact the clock ticks in your favor .
On the main topic if i were you i'd pull the grow,apt growing is the easiest way to get busted growing , you need private space to grow .