my tilapia have been spawning for the past four months, so I'm very much into the learing curve; I've placed the fry into a 10 gallon tank, but one of the problems has been as time passes the older fry get bigger and the new fry get eaten!
My wife has done a yeoman's job of trying to net out the hungry "monster fry" but not a good solution; I tried googling "small fish graders" or "small fish sorters" and all I found were massive machines costing hundreds if not thousands of dollars.
Solution: make my own! The prototype is made from acrylic and 304 stainless steel tubing, and it works very well sorting the perpetual hungry from the innocents <g>[attachment=0:4pzwnjy2]100_2539.jpg[/attachment:4pzwnjy2]
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