SOLUTION to your float valve prop..
Just an idea that works..thanx to GHE [emoji3]
You need 2 buckets.
1.Connect your res to one bucket. That bucket should hold your float valve at the water lewel you need.
Lets call that your controller. It controls your water lavel...
2.connect your controller's float valve to another bucket (bottom of bucket) Lets call that you Top up res. That the res you fill up whit fres nutes."top up"
Put the top up res, on top of your controller, so the gravity can feed nutes to your controllers float valve.
Done
Did it make sense. Im pretty stoned right now so bare with me..
[emoji317]