I did a bit of googling for you:

From Gardenscure:

"Coco is a bit dirty for recirculating. It only needs water once every two/three days in veg and once a day in flower. Mix the coco 60/40 with perlite and add an inch of clay balls to the bottom of the pot for best results."

From Canna Nation:

"im a coco grower and find that a weekly feed is more than enough, others feed them more often than that, but imo a weekly feed is all thats needed (IMG:style_emoticons/default/peace.gif) i usually feed once a week, wait 2-3 days for the pot to dry out and then give them plain, pH adjusted water and they do fine"

Don't drown your babies - you don't want the medium to be constantly saturated - actually you should wait until it is just about dry before watering. You can watch the plants to see when they need water - if they start to droop/wilt a bit, they're thirsty - don't worry it won't hurt them. They'll perk back up VERY quickly (within an hour or so) as soon as you water them. I would suggest ditching the watering system for now, water by hand until you know how often they need to be watered and then set your system up on a timer.

Constantly wet roots will result in root rot, plant death, and a slimy mess.