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ahh so i could only use a 20L top up if i tried it that way then? could i use 2x 20L top ups? one at iether side. that would probably do me.

yes, what you would have to decide is whether it's worth it or not to do it that way. Whats happens is all three tanks will share all the water. So you increase the nutes needed by 3 times. *in hydro...

If you can raise a 40 L rez even a few inches above the other, you can use a 10 dollar float valve (kinda like a toilet valve) and just top off with water.
 
float valve.jpg


when the bobber goes down, the valve opens. when the bobber goes up, the valve closes.
 
After a certain point the still kind of runs on autopilot, then I can kick back and watch.
 
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