
Worked fantastic, stopped 2 super aggressive cichlids about 3-4 inches long from killing each other. My tank is a traditional 29 gallon tank with 18 3/4 inches on top. bottom and 12 1/4 - 12 1/2 inches from front window to rear window. I had to fill the bottom with gravel about an inch or so to keep it in place. The barrier is like a plastic mesh that lets water through. The only reason I took off a star was the price. If you have really big fish this barrier might not be strong enough if they ram their head/mouth in. They can still see each other and try to break through the barrier, but that's no use. I uploaded a video to show the barrier in action xD.

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