If you're having a problem with pests in the growroom, spiders can be effective at removing them... but you'd have to deal with their webs covering your plants in order for them to catch their prey. A better alternative, in my opinion, are ladybugs. They're one of the best pest assassins you can have in a growroom. They won't eat your plants, and they're great at eradicating (or nearly eradicating) many types of infestations.

If you don't have any pests in your growroom, I'd put the spider outside where it can have access to a better source of food.

Take care. :jointsmile: