welcome to the boards

feeding cycles vary from system to system... typically with an ebb and flow i believe you feed them about 4 times a day, I've read about people feeding up to 6..

You fill the flood tray with the bucket in it for about 15 minutes, and then drain it.

Keep in mind you aren't supposed to water an hour before the dark cycle, and not water an hour after the light cycle begins.. Make sure you do your last feeding a few hours before the lights turn off..

If you were feeding your plants 4 times a day, During its light cycle... you would the pump run for aprox 15 minutes (or however long it takes to fill up all your five gallon buckets), and then keep it off for 4 hours, refilling it for 15 minutes every 4... this would be 4 feedings in aprox a 16-18 hour light schedule...

feedings my vary depending on the air tightness of your system... if its very air tight you might not require so many waterings.. maybe 3 times a day... but if its not air tight you might need to water it maybe 6 times a day

remember no water during its dark cycle

also, the overflow fitting is essential, so you dont have to muck around with timing so much.

hope this helps!