I've been looking at pumps with float switches

https://www.surpluscenter.com/item.a...&catname=water

https://www.surpluscenter.com/item.a...&catname=water

I'm thinking i can figure out my flow time from fish container to my grow bed max water level (bellvalve) so that it fills the sump and pumps back into the fish every half hour or so.

But back to my feeding, If i get a water test kit and monitor my water do you still think letting the fish "graze" will lead to problems? assuming i feed them a somewhat controlled amount? So far it's been really easy to keep the water clean having all their food attached to a branch. I also won't run out of branches, since i've started this i have also been watering that bush with the concentration of waste solids from the bottom of the tub. The result is that that bush has doubled in size and it's sibling bush on the other side of my yard has stayed the same size.