Blue | 水產百科網

ButanevenmoreattractiveoptionistheBluebackBlue-eye(Pseudomugilcyanodorsalis),whichsportsayellowbodyaccentedbycolorfulfin ...

One of the biggest frustrations with keeping smaller reef aquariums, particularly those under five gallons, is in finding fish species that are suitable for such tight accommodations. Despite the vast biodiversity of coral reef ecosystems, surprisingly little of this ichthyofauna is of an appropriately small size, especially when it comes to fishes that actively swim about. There are a few viable options—Trimma gobies, Aioliops dartfishes, the Redspot Cardinalfish (Apogon parvulus)—but these tends to be quite delicate and often difficult to find for sale. And this is why blue-eyes might be the perfect reef-safe nano fish.

Sparring males of the Blueback Blue-eye (Pseudomugil cyanodorsalis) Credit: fmborussia

If you’re at all familiar with blue-eyes, it’s from having encountered them in freshwater aquariums, as...