Cobalt Aquatics Small Reef Tank is the best tank for small fishes. The Cobalt reef tank is also available in three different sizes. The small reef tank has an 8-gallon capacity, 6W black mini LED lamp, clear Vue 20 internal filter, 3-year warranty, and black and white color option. The Cobalt reef tank, perfect for your fishes, provides a safe and healthy environment, available at affordable prices.