u can get rid of one of those pumps and use gravity to feed in one direction. u will need to have ur res above your plant res or vis versa. mite save u some money.
the 70l air pumps are good. put out a good amount of bubbles. I run 2 but i am trying bubbleponics. You just need one to oxygenenate your res. so one shood do fine
the desgin looks good. do a good bit of reasarch copy a system that works that way u kinda have a blueprint and you can always ask the thread creator how he or she has done something.
thanks decisions decisions. i wonder if it would be more effective to go with hempy buckets, or 3 gallon smart pots with coco, hmm thanks for the reply hendrix take care!