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Whether you're new to the fishkeeping hobby or consider yourself to be something of an expert, a 15 gallon fish tank represents the perfect opportunity to build up a medium sized, manageable underwater ecosystem. With plenty of high-tech models in our 15 gallon aquarium range, you're even more likely to succeed on your fishkeeping endeavours. Prefer to start a little smaller before working up to a 15 gallon tank? Take a look at our 5-gallon fish tanks collection.