In a 5x5 tent Id say like 9 buckets would be a good number so they have some space . I own an online hydro store actual 2 so i have access to the bb N grow schematics but had to locate parts which I did. Your local hydro store is selling just the brain bucket for $447? wow what a rip off joint.the brain bucket shouldnt be that high. Im thinking my brain bucket will be able to be made for around $90 and then to make it a 12 plant setup with res total wholesale cost of parts would be like $160 with pumps fittings and buckets. If i added a 55 gallon drum for a res that adds $40 but its not need you can use a simple rubeermaid tub from walmart for about $12. Depending on time I will see what I can price these for think Ill offer it in a few versions like just the brain bcuket, complete 12 site unit,less buckets setup, without res or with, with or without pumps if people have thier own already.If you need another tent let me know I have good deals and digital ballast and light kits.