Mandarin fish

The mandarinfish or mandarin dragonet (Synchiropus splendidus), is a small, brightly-colored member of the dragonet family, which is popular in the saltwater aquarium trade. The mandarinfish is native to the Pacific, ranging approximately from the Ryukyu Islands south to Australia. It is also somewhat misleadingly known as the mandarin goby, due to its resemblance to blennies and gobies. Other trade names include "green mandarinfish", "scribble fish", "striped mandarinfish", or "psychedelic fish". The name psychedelic mandarin is also used for a closely related species, the picturesque dragonet, Synchiropus picturatus.

Mandarinfish are reef dwellers, preferring sheltered lagoons and inshore reefs. While they are slow-moving and fairly common within their range, they are not easily seen due to their bottom-feeding habit and their small size (reaching only about 6 cm). They feed primarily on small crustaceans and other invertebrates. The name of the mandarinfish comes from its extremely vivid coloration, evoking the robes of an Imperial Chinese mandarin.

Despite their popularity in the aquarium trade, mandarinfish are considered difficult to keep, as their feeding habits are very specific. Some fish never adapt to aquarium life, refusing to eat anything but live amphipods and copepods (as in the wild), though individuals that do acclimatize to aquarium food are considered to be quite hardy and highly resistant to diseases such as ich. They cannot contract the disease Ichthyophthirius because they do not have the skin type that this common aquarium disease affects.

Discus Fish

Another freshwater species, Discus are probably the single most beautiful species of Freshwater fish. They are also probably the most expensive Freshwater species, second only to the Koi or the Arowana. A small 3 inch juvenile can be anywhere from $50-$80. There are many color variations of Discus, most of which are simply breathtaking. Although they are Freshwater species, they do require more experience and care than some Saltwater fish.

Lion fish

Probably one of my favorite fish of all time, the Lionfish (or Zebrafish) is a fascinating species, and is easy to become mesmerized by one when watching it swim. The spines you see on its back possess a painful and powerful venom. Thankfully the Lionfish is somewhat docile and not a fast swimmer, but all aquarists who own one must take extra care when cleaning their tank.

Moorish Idol fish

One of the most difficult fish to keep in a home aquarium (and very expensive as well), to most aquarists these fish are the pinnacle of the hobby. You may think you’ve seen them before, but you’re probably getting them confused with another species, the Bannerfish (also known as the False Idol). In eight years of the hobby, I’ve only ever seen these fish for sale in shops on three occasions.

Koi Fish

Yeah sure, most of the Koi you have seen are probably nothing more than orange or white. However, there are many (probably close to or more than 100) color variations of Koi (Just pick up a Koi trader’s magazine the next time you’re at a bookstore). Koi can comer in many colors, including orange, red, white, gold, and black. Certain patterns are sought after by avid Koi collectors, some of whom will pay thousands of dollars for a single fish.

Flame Angel Fish

A close relative of the Coral Beauty, the Flame Angel has some of the boldest color of any fish I’ve seen. As with the Coral Beauty, these fish are usually easily available and affordable, but from my experience are a bit more fickle than the Coral Beauty.