Can anyone tell me what size pump I need for a 420 litre fish tank:confused:i have had the tank for over a year and have recently moved to acreage and tank water my fish are gasping for oxygen and the filter is constantly black what can I do to help my fish

I have goldfish ina big swimming pool 4 20 year and they still did not and very big without a pump. About 3to4 days I give them 3slices of bread.(I have about 150 big ones and 500 small ones

1 have goldfish in a big swimming pool 4 20 year and they still did not die and very big without a pump. About 3to4 days I give them 3 slices of bread.(I have about 150 big ones and 500 small ones
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