Here's an idea I've been thinking about recently that adopts a header tank, flood and drain gravel beds, a syphon, and floating raft. A small pump, pumps from the fish tank into the higher header tank that has a floating raft on top and yabbies underneath the raft to consume incoming solids. This header tank slowly fills, lowering the water level in the fish tank. Because the growbeds are all plumbed into the fish tank these also drain of water as the fish tank level goes down, with the water level in the fish tank and growbeds being almost the same.
Then as the header tank fills it starts an auto syphon that drains the water back to the fish tank, raising the fish tank level, and also flooding the gravel growbeds at the same time. The header tank would have a cut of point of about half full so that the yabbies and floating plants would still have sufficient water.
One of the issues I can see with the system is solids, I'm not sure that the small pump into the header tank would push many solids up. Also I think the inlet/outlet into the growbeds would probably require some access to allow for occassional root removal.
I think this would be a fairly efficient system though, as there's only minimal pumping...
Any thoughts?
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s pic in the wheelie bin challenge got me thinking along those lines 
Thats where I saw it before it was you making suggestions about how to fix my barrel system Johnnie, and you pointed me to that before... 
).
