NO TOMATOES!!!!!!! Sorry for yelling but you will ruin your girls so fast with them in there. Tomatoes have a high tendency for mosaic virus, which MJ will pick up very easily and severly threaten your other plants. Pepper plants can be good, garlic is great in little starter pots, makes an excellent pest repellant. I wouldn't put any type of squash, cucumber or other plant that is susiptible to types of mold and mosiac virus.
Companion planting can be benefical for insect control in a growroom and in outdoor grow areas but there is much to learn about what pests and dieseases they are prone to before putting them close to our precious girls.
Good Luck with it