Anything will work, my vegging plants are just out in the open, I did get a tent for my flowering plants cuz it's hard to keep open space light proof...Anyway it was only like $75 and it's 5 feet tall and 4 feet wide, but only like 2 feet deep...it's kinda like a small hallway...would like one that is square, but that was the cheap one...it costs some money to do this properly, It doesn't take much, but to get something you aren't embarassed of there is some upfront cost...it is totally worth it though to have everything doing what you want and having things how you want them...See I started out thinking I didn't need this or that...or I could use this or that, and then I realized I was just throwing the money away in the first place...You can make anything into a grow box...Holy hell in my areas craigslist somebody sells really nice 4'x4'x3' aquaponics setups with the fish included...for a good price considering the way that all works. Seems like a serious time and money saver long term, although kinda pricey in the beginning, but you get a garden and a pet...2 for 1