Tank size is relative. Next to a 4,000 gallon tank, a 1,000 gallon tank would be small. A 4,000 gallon tank next to a 10,000 gallon tank would be small. A 55 gallon tank compared to a 10 gallon tank would be large, but compared to a 1,000 or 1500 gallon tank, or even an 800 gallon tank, or perhaps a 300 gallon tank, it would be small. Tank size is relative and based on one's perspective.