Hello. I have some speakers that are about 2 feet in width, 2 feet in length, and 3 feet in height. all hollow. do you think i would be able to grow in there? i started a grow in there before and it grew 5 inches in 6 days but then i killed it because i didnt know if the whole process would work or not and i didnt want to waste my time. any help would be greatly appreciated. thanks.