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In comparison to other common aquarium fish, goldfish have high oxygen needs and produce a large amount of waste due to the fact they lack a stomach; [57] therefore they require a substantial volume of well-filtered water to thrive. In addition, all goldfish varieties have the potential to reach 5 inches (130 mm) in total length, with single ...
Mature goldfish will require a minimum tank size of 20 gallons per fish to allow ample swimming room and create a "buffer zone" that will delay the effects toxins like ammonia and nitrites from building up quickly. A larger tank also promotes healthy growth and development.
A goldfish aquarium can be set up as an unfurnished and bare-bottom tank to emphasize the bright coloration of the fish. A combination of different varieties of goldfish and decorations that contrast with the vivid colors of the fish would make an attractive display. [ 1 ]
Mixing just as well with similar-sized fish as they do with their own species, these fully aquatic additions can reach up to 6.4 cm in size and live for five to seven years on average.
The bicolor pseudochromis is semi-aggressive and will defend its territory against fish several times its size. This fish is fairly hardy, and is a good beginner fish. 6 cm (2.4 in) Blue flavivertex pseudochromis: Pseudochromis flavivertex: May eat shrimps: Captive bred specimens are sometimes available: 8 cm (3.1 in) Bluelined dottyback
It is a dorsal-less fish – good specimens will have a clean back and eye bubbles that match in color and size. Their bubbles are quite delicate, so the fish should be kept separately from boisterous types, as well as sharp tank decor. Although the bubbles will regrow if punctured, an injury could leave the fish prone to infections.
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