The air pump is something I had laying around so I decided to go with it. Surely it can't hurt anything. As for the spray line, it sets on the lip of the tub. If the roots grow to big then I will swap the top 10 gallon tub out for a 15 gallon tub. I plan on growing from seed and vegging for about a week, then going straight into flower. I want to keep then fairly small. I have limited height about 60". That's why I went with the smaller tub. I will be using general hydroponics 3 part nutrient and liquid koolbloom for flower. I also planning on flushing the entire system with florakleen at every resirvoir change(every 7-10 days or so), to break up any accumulated salts. I also have a 400 watt air cooled hps I'll be using during the flowering cycle. Fluros during seedling stage and veg. I'm curious if anyone has any suggestions on how long to run the spayers for? I have heard several different opinions and I'm leaning towards 24/7. I will post more pics once I start growing. Also how strong of a smell does Northern Lights put off?Thanx alot for your input, it is appreciated.