Here ya go, step-by-step instructions.

But for 20 plants you'll probably want to at least double the size.
PharmaCan Reviewed by PharmaCan on . growbox help!! alryt JC here iv got evrything sorted:lights fans etc. and about 20 or so plants but now i need a growbox quick!! lol is there anyone who can help me? thanx people peace JC:rastasmoke: Rating: 5