I have a small one Bought for my 10 gallon tank. That's the perfect height. I also have one for my 5 gallon shrimp tank and had to dip the suction cup of the bowl into the substrate to keep the tube from sticking out too far. It takes time a little each time until they find it as African Dwarf Frogs don't look good but it works great to contain their food.The tube is narrow so I have to dice the shrimp but as it thaws the food sinks onto the plate .pipe when they get in, but to counteract this I placed the pipe low on the plate so they don't have the space they need to get into the pipe.
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