Anybody keep fish in tanks for food

[NorthernRaider]

Partially right, water changes are especially needed with cyprinids as they pee continiously to maintain their chemical balance, thus they end up swimming around in their own pee and uric acid is not removed by filtration unless the aeroboic and anaerobic cycles are top notch. Then of course cyprinids are pigs they will eat almost anything that goes into their mouths, and many of em do not have stomaches as we know it so only 10% of what they eat gets absorbed the rest gets poohed back into the water. Thats why carp in stew ponds do so well cos they fertilise the pond plants.