It also depends on how many plants you have room and light for. I would guess you couldn't grow more than 4 plants efficiently in a resevoir of 8 gallons or less. I can only house 3 plants, or 4 really small ones in my 5 gallon ebb n' flow. If you're looking to grow more than that, definitly go with the larger.
Stormcooker Reviewed by Stormcooker on . 8 Gallon reservoir vs 40 Gallon????? I want to get a hydro system but i am not sure which one would be better. What would be better to have, a large or small reservoir? The links are the two that i want to decide from but not sure if i want a small reservoir or a large on. Plus if someone knows if these two sites are reputeable, please add that. http://www.altgarden.com/site/systems/htmldocs/6waterfarmkit.html http://www.truevisionhydroponics.com/shop/index.php?action=item&id=12&prevaction=category&previd=3&prevstart=0 Rating: 5