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The usual reason is a failure to keep to the 3 basic rules of fishkeeping. Those rules are :- 1 inch of fish needs a minimum of 1 gallon of water, every tank needs a fully cycled filter and every tank needs to have at least 50% of its water changed each week. Fail to observe any one or all of those 3 items and you are guaranteed to fail in keeping fish alive successfully.

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16y ago

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