Well i would have the chiller on a closed loop, looks like something like this chiller to a 20 gal res then into a coil thats in the main res. and then loop back to the res. Im thinking this to achieve the most eco plus way to chill 55gal. Easyer to chill 2ogal.
And use volume to chill the larger one, plus it keeps the chiller clean.
The ebb has a pump that goes from the res to the control box, theres to level switches one to stop a over flood and
The other to pump back the water to a zero level. The control box with the over flow switch allows the buckets to flood
Up to 3in from the top of the buckets, the timer is 24hr 15min pins. For 30 i flood for 30min. Each flood, now with veg
I flood x4 during lights on and bloom x3 floods all floods are 30 min long. During the first week from transplant i raised
The command box up 2 in. To raise the water line on all the buckets while roots develop the drop it back down, dont
Go more than 2 in or a flood could happen. Its important to keep the command box next to the res, reason for this is to
Leason the water that drains from the top edge of the res and back flood the command switch in the command box and trip
The pump, if this happens it wil constantly repeat and burn the pump up, so the drum needs to be next to the res. Hope
This all makes sense lol.