Rambo:
Unless you can connect recirculating tanks with 2 1/2" inch piping just forget about it. I tried all manner of connections with 1" and just ended up always clogged by roots. Water in at the bottom and out at the top worked best but was eventually clogged when I forgot to clear it it a couple of days. Then I had a minor flood.
I don't know how starting seeds in glasses of water and paper towels ever got started or why but it is not needed and can be harmful to the germination and the all important tap root. I know thousands of guys will claim success because their plant grows but is it all it could have been? 1. Look at an emerging tap root under a microscope; you will see thousands of tiny lateral root hairs. These root hairs grow into the fibers of the paper towels and are stripped off when removed from the towel. 2. You bump and damage the delicate root tip trying to plant it. These actions will slow and/or stunt the plant. Soaking seeds prevents oxygen from getting to the root as it cracks the shell again slow and/or stunt the plant. Use Rapid Rooters for soil and rockwool for starting your hydro seeds. Put the seed point up into the medium ~ 1/2" deep, control the temperature ~ 78°F they will germinate just fine without damage to the little tap root and its laterals.
.
