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KaiTheFishGuy
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Kai is a systematic ichthyologist at The Australian Museum, Sydney. His research interests combine the use of cutting-edge next generation sequencing techniques with traditional methods of morphology to better understand the evolutionary history of coral reef fishes. He is a legacy ReefBuilders contributor, having previously written close to give hundred articles under his pseudonym LemonTYK.

Orange frogspawn coral from Vietnam is jaw-dropping and stunning

In the recent years, we’ve seen quite a number of “orange” Euphyllia trickling in from Australia and Indonesia such as the famous orange hammer coral, and the pretty elusive orange branching frogspawn coral. Unfortunately, as the popularity for these exotic Euphyllias peaked,…

Hybrid multicolor angelfish from Cebu may not be a coincidence after all

Centropyge hybrids are currently the cool kids at the party and have been circulating the industry and internet so widely that you might think it’ll be hard to pull another textbook-defying specimen out of the sea. While super rare hybrids…

A closer look at the elusive Pseudochromis marshallensis, the Marshall Island dottyback

The Marshall Island dottyback, ironically, is not endemic to the area as it’s name suggests. It is however, seldom seen in the trade. The slender Pseudochromis marshallensis is grey overall with only splashes of yellow on the tail and unpaired…

Male Plesiops coeruleolineatus is a little orange throated beast of a fish

Plesiops coeruleolineatus is a cryptic little fish that is not often seen in the hobby. Aptly named the Crimsontip Longfin, the fish is equal parts crimsontipped and equal parts long-finned. Though usually drably colored, males can get absolutely gorgeous when…

Freshly caught deepwater Atlantic rarities puts the “D” in deep

The awesome Lipogramma evides pictured above is just one of many super rare fishes recently brought up from the deepwaters of Curacao. The seemingly boring looking fish in monochrome may look ordinary, but do not be fooled. L. evides is…

The “pygmy kingi” Eibli x Halfblack angelfish gets an update

When we first shared about this unique hybrid four months ago, we provided pretty subpar pictures of the fish, disallowing us to showcase it’s truly unique appearance. The squiggly maze like markings that is inscribed in this fairly common hybrid…

Cocos island lemonpeel angelfish are the blue eyed boys from the Indian Ocean

And we mean that literally! The lesser known Indian Ocean form of the lemonpeel angelfish (Centropyge flavissimus), have eluded aquarists for quite some time now, rarely making it into the trade. Originating from the Christmas Islands and Cocos-Keeling, a.k.a Joculator…

LiveAquaria offered for sale a beautiful and unique Chaetodon miliaris X C. multicinctus butterflyfish hybrid

LiveAquaria just released a nice and very rare hybrid butterflyfish between Chaetodon miliaris and C. multicinctus. The lovely fish from Hawaii may not be as colorful as the other rare hybrid butterflyfishes that we’ve posted here before, but the fish is…

Opistognathus albicaudatus, a brand new species of Jawfish from the Andaman islands

Ospitognathus albicaudatus is a brand new species of jawfish described from two specimens caught in the Andaman Sea. The aptly named White-tailed Jawfish is apparently endemic to the Fusilier Straits of the Andaman Islands and is closely related to O.…

Almost full black Rock Beauty Angelfish is a unique stunner

We’ve posted so many aberrantly colored fishes here on ReefBuilders that it has become part of the norm to expect something weird and off-colored to pop up every now and then. Yet it never gets old and each fish lucky…