thanks f.f., you answered all of my q's and then some. i misspoke when i said i have a 40 gal. res, it's 50 gal. and from what you said, it sounds like it'll be the right size.
i have a 2 rubbermaid setup(7 plants each)going now w/ a 25 gal. res. and i cannot believe how much bigger, denser...