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The only problem I"ve had is when I forgot to clean the back sponge prefilter. It clogs up, and the small pump keeps going and will actually empty the sump and create a 'waterfall' from the tank, to the back sump. I've lost 5 at least cherry barbs to the waterfall/sump. Once in there, it's about impossible to get the live fish out of there. So be sure to keep the sponge filters clean.

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