Black Ranchu 5cm

Black Ranchu

Entering the world of fancy goldfish presents a vast array of different and colourful goldfish. Where most goldfish sport colours of orange, white, yellows and reds the black Ranchu is unique in the fact that it is almost jet black. The ranchu is most popular because of the bubbly wen that individuals can develop on their heads. Where in some goldfish variants the wen stops at the top of the head, in ranchus it can grow all over their face giving them this adorable, chubby look. Ranchus are also prized for their larger overlapping scales, the tri-tipped tail and most importantly their stubby bovine like body which often leads to them getting called the Buffalo goldfish.

The black ranchu is also one of the more coveted ranchu variants because of the amazing contrast it adds to a goldfish aquarium. Though they are usually bold black, some individuals can develop a copper colour to their belly which makes them contrast even more. Ranchu and goldfish in general are great algae eaters and will make a fantastic addition to outdoor ponds as they will readily graze and eat any algae which can proficiently grow in sunny pond conditions. It isn’t recommended to keep Ranchu all year round however in outdoor conditions as they have been bred in tropical conditions, due to their stubby nature, digestion and organ functioning can be compromised in cold environments.

Black ranchu are also a large growing goldfish often reaching fist size or bigger. Because of this they aren’t exactly beginner fish and are better suited to more experienced aquarists looking to broaden their goldfish varieties. Due to their larger size and structure, they aren’t as active as other goldfish varieties like fantails. Black ranchus do spend a decent amount of their time swimming but you can also observe them lounging around in corner of the aquarium or slowly skimming the bottom of the tank which almost looks like a cow grazing. The black ranchus max out at around 20 cm long and are actually not found naturally in the wild as they are selectively bred fish for the captive environment.

Tank Recommendations for Black Ranchu

Because the Black Ranchu goldfish can get fairly big at 20 cm, they also get fairly wide and can be a heavy goldfish meaning that an individual Ranchu would need around 75 litres (20 gallons) however they are recommended to be kept together with other fancy goldfish. So when keeping multiple goldfish together a larger tank would be needed, an ideal tank size for not only Ranchu but all fancy goldfish would be 120 cm x 60 cm x 60 cm. The thing to note however with Ranchu goldfish is that their stubby body and shorter fins make them not the best swimmer so a slower flow is better. Both in a pond or aquarium, a sand substrate is best as Ranchu will actively sift through the sand and smooth river stones can be added for further decoration. Sharp materials should be avoided in the aquarium-like pointy driftwood especially for Ranchu because they can easily damage their wen. This can lead to infection and immune-related diseases with the fish.  

Suitable Tank Buddies

Black ranchu are a great fish as they are not aggressive in the slightest and can be kept with tank mates. Common tank mates they can be kept with are active and small subtropical tolerant fish. The goldfish however might eat fry produced by these smaller fish however they will be perfectly fine with adults. Fin nipping species however should be avoided entirely as they will make short work of the ranchus fins.

Usually Compatible

Other fancy goldfish species, Medaka ricefish, giant danios, zebra danio, White Cloud Mountain minnows

Sometimes Compatible

Species can be fin nippers like rosy barbs and also tropical species such as angelfish, dwarf cichlids, mollies and species of a similar sort. These goldfish can be perfectly kept in tropical water these tropical fish listed may not have the same habitat requirements as the fantails or may outcompete goldfish. 

Rarely Compatible

Larger cichlids and fish which have a mouth large such as Oscars, jaguar cichlids and shrimp should also be avoided as Ranchus will eat shrimp in an instant.

Feeding your Ranchu Goldfish

Feeding Ranchu should be a breeze, they should immediately take to any aquarium food practically in 24 hours of being added to their new home. Having other Ranchu and fancy goldfish tank mates as well will really make them show a better feeding response. Slow sinking foods would be best as Ranchu have been known to at times get swim bladder issues after frantically gulping for food at the surface. Good quality pellets or flakes which are rich in algae or spirulina content is best to suit their herbivorous diet.