The paper cups was a crap idea for flood and drain when they got wet the holes i had in them closed up from expansion also they wanted to tip over because the small cavity at the bottom held air in it.
The seedlingss have gone into the system which is set at 1.0ec and 5.8 PH.
The pump hose is organised with two elbows so that it can be twisted and rotated out of the way when the top tray is to be moved. the hose reaches the bottom so when the pump stops the nutrients will syphon back out, to get the last of the water out every cycle there is a 3mm hole that it can dribble out.
So I ended up with plastic cups after all with my wifes help to find them in the shops.
All seeds are in cups now.
Happy growing everyone and good luck.