Thuwad ignore last post.

Yes, it helps to have that big a res; especially if you want to add w/f's as you go. Yes, they only hold 2 gals apiece but they're going to eat a fair amount daily as they get bigger and larger amounts stay more stable. If you don't mind adding a LARGE amount of new nutes DAILY during flowering (when they really eat) then of ok but I would go with no LESS than a 20 gal res and a 30 would be much more likely. With 8-40 absolutely. And a good water pump and a place to access and dispose of your water......closer the better.