Was thinking about using this in a micro grow, will be a small setup with like 60-90 watts of cfl and i was thinking about using one or two 120 mm comupter fans for the ventilation in combination with one of these ona-buckets but in micro grow size, how often do you have to refill these things? I will be using about 1/5 of a gallon at a time, and i was planning on using some low-smell strain so it wont get too stinky.