Couple questions/comments here- if i understand you correctly your going to use the storage bin as your reservoir with a pump running to a dripper up on the plant, draining back into the storage bin? If so you might wanna rethink this, several problems with recirculating systems- A) Ph fluctions happen more frequently when reusing solution. B) using the same solution continuously can be problematic feed wise as the solution passes through your plant it will obviously use up some of those nutrients, this means that your not giving the same concentration of nutrients everytime as its constantly depleting. C) weekly changing of the solution becomes more of a pain than manual watering, the point of automating anything is to make it be less work on you right? does constantly moving your plants off the buckets, fighting with whatever other equipment has to be moved to get the plants moved, fighting with equipment to remove the storage bin, vigorously cleaning, replacing water, dialing back in nutrients, putting back other equipment, putting back plants.. it may not sound like much in theory but trust me, when your back starts breaking from constantly doing these things you'll be rethinking it anyway.
So with all that said here's my recommendation- get an appropriate sizes barrel to use as a reservoir outside your tent/grow area, i use a 16gal barrel for my 4 flowering plants, having it outside the grow area is recommended because you can drain, fill, adjust, etc without having to worry about interrupting the light cycle.
The next step can go one of two ways- if you can afford it get you some ebb and flow pots, i use 2gal ones, that have drains out the bottom with barbs for drain out hose, ill attach a photo below that shows how mine are setup, this allows you to plumb all the drains to a "catch&drain" bucket, i have mine setup with a float valve activated pump so that as the run off collects in the bucket it eventually triggers the float valve and gets pumped straight out a nearby exterior wall. This is the preferred way to go imo.
Alternatively if you cant afford the EnF pots, or otherwise cannot setup a drain out system then opt for some fabric grow pots like SmartPots, the fabric pots do extremely well with coco, some of my best rootballs (and buds) ever have been with coco in smartpots, use a standard single-pot plastic tray underneath to catch the runoff or opt for a large tray to fit your whole tent/space to set them all in, i always prefer a tray fit to my tent size however single-pot trays are nice because you can just pick up one plant at a time to remove the tray to empty/clean it.
Then all you need to do is ditch the drippers, drippers suck, they get clogged, they distribute unevenly, they only apply solution in 1 spot, just forget them. Look up FloraFlex, i use their 6inch v2 caps in my pots with 2 1/4 fill lines going to each. i use a 300gph pump for my supply, and i only have to feed for exactly 1 minute to get a good 15-20% runoff, they never get clogged, they distribute exactly the same to each pot and apply the solution over the 6inch square area as apposed to 1 spot.
If you have any questions please feel free to ask, hope this helped you get a better idea for your setup, happy growing!
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