Yeah, I think it's because the length of tubing to the last one which is alot bigger than the length to the first two, it's getting like 1/2 the water
with I had rolling trays now cuz I can't climb back there lol. But he's pretty sure it's the long tubing, it wouldn't be a problem I don't think if all the main lines of tubing off each pump were the same length, I think that's the issue, the first one gets water ASAP, the 2nd not bad, the 3rd just not enough, I'd have to run the pump 2x as long to get the same water on that one which I can't do. The plants seem OK but just dull I think salts building up in them. After harvest I can either make each main line of tubing the same length or just go with the 1 piece manifold, I'll have to play around to see what's easier to get it going