if your going to use a drip manifold like the apollos u find at the home depot try and keep the distance from the rez to the plants as short as possible.also if u have some plants that are 20 ft away and some that are 2 ft from the rez/manifold its a really good idea to cut your tubing all the same length.if your pump is under powerd what ends up happening is your shortest runs spit out all the water and the ones furthest away may not get any water at all.ive been there and it sucks.the last month of flowering i couldnt even get into my room "my plants took over" so i pulled em alll out and fabbed up a drip system,well lets say i had 2 do it twice,about 6 hours later and a whole lot of swearing i finally figured out that it works the best with equal lengths.good luck