Built mine out of egg crate & zap straps. After I cut the zap straps short, then I use a lighter to melt the sharp edges so the fish don't cut themselves. Same procedure with an sharp edges on the egg crate. Rinse off and you're good to go. I found that it worked well cause my fish would get a chance to see, smell, "taste" and otherwise get to know the new fish for several days before being released. This very much cut down on aggression towards the new fish. It sometimes didn't completely eliminate aggression, but I'm sure that it was less. Sometimes though, the old fish would relentlessly attack the box and so I knew I couldn't add that new fish in without starting a war. Better to be able to scoop out the fish from an isolation chamber (my name for it) than have to tear down my display aquascape to catch it out.
Anthony
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