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I have been struggling with a design effort for three years and haven't arrived at an answer yet.
In the beginning when I'm dealing with very tiny babies, plenty of live food and a constant trickle in of ground water (well) helps keep the toby problem down. Since there is no filtration on this effort because of the restriction on the use of a pump, I can control the color of the water by the water feed in and numbers of babies in the holding pen. Once the babies get up around 3 weeks old the concern of toby attachs as you discribe is a real concern. This is when the babies are big enough to put a pump and filtration on the containment pond and beginning working hard with clear water and good sight to keep numbers down by contantly sizing toby's.
It's alot of work but I actually find that one giant green pond big enough to disperse the numbers seems by fall the best results with alot less handling. I will have culled only twice during that grow out period.
hopefully both you and i will be enlightened in a zen sort of way by someone else with some different ponderings....
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