1 / 9German Blue Ram
The German blue ram is arguably the most stunning fish available in the freshwater hobby under three inches. Its body is yellow-gold with electric blue iridescent spots, red patches around the eyes, and black markings on the dorsal fin. It requires warm, soft, acidic water around 78°F–86°F with pH 5.5–7.0, which makes it more demanding than most community fish, but the visual payoff is extraordinary. Best kept as a pair in a planted tank.
2 / 9Peacock Cichlid
Peacock cichlids from Lake Malawi come in shades of electric blue, orange, yellow, and red, often on the same fish. Males are the colorful sex and display their best color when comfortable and competing. They need hard, alkaline water typical of the Rift Lakes, which is the opposite of most tropical fish. A species-appropriate tank with other Malawi cichlids brings out their full territorial and color display.
3 / 9Boesemani Rainbowfish
Boesemani rainbowfish have a remarkable split coloration: the front half of the body is blue-purple to grey, and the back half transitions to vivid orange-red. The division is sharp and dramatic, especially on adult males. They are active schooling fish that need open swimming space and a tank of at least 30 gallons. Their color intensifies significantly in well-maintained water with good lighting.
4 / 9Discus
Discus are called the king of the aquarium for a reason. Captive-bred varieties come in solid red, royal blue, turquoise, leopard, and pigeon blood patterns, with some fish showing complex, almost painted markings. They require very warm, soft, acidic, pristine water and frequent water changes. They are not beginner fish, but experienced aquarists who meet their needs are rewarded with fish of unmatched beauty that often recognize their owners.
5 / 9Scarlet Badis
The scarlet badis is a micro predator barely over three-quarters of an inch long, but males are extraordinarily colorful: deep red with blue iridescent banding on the body and fins. They are shy, slow-moving fish that do poorly with active or boisterous tank mates. Best kept in nano tanks with live plants and fed small live or frozen foods like daphnia, baby brine shrimp, or micro worms.
6 / 9Electric Blue Acara
The electric blue acara is a South American cichlid that lives up to its name. Its body is covered in shimmering blue-green iridescence with subtle orange on the dorsal fin edge. Unlike many cichlids it is relatively peaceful and works in community tanks with larger fish. It is hardy, eats prepared foods readily, and tolerates a range of water conditions. A relatively easy fish to keep well that looks like it should be much harder.
7 / 9Endler's Livebearer
Endlers are closely related to guppies but smaller and often more intensely colored. Males display neon green, orange, black, and yellow in patterns that vary widely between strains. They are active, adaptable, and breed readily. A colony of Endlers in a well-planted nano tank is one of the most visually alive setups in the hobby. They stay under one inch and are safe with any fish too large to eat them.
8 / 9Flowerhorn Cichlid
The flowerhorn is a hybrid cichlid bred specifically for its extreme appearance: a large nuchal hump on the forehead and body coloration ranging from bright red and orange to pink and purple with black patterning. They are large, aggressive, and must be kept alone or with only very robust tank mates. They are interactive fish that often respond to their owners and can be hand-fed. Not community fish, but visually unlike anything else in freshwater.
9 / 9Cardinal Tetra
The cardinal tetra is the more vivid relative of the neon tetra. Its red stripe runs the full length of the body rather than just the back half, making it noticeably more striking. A school of twenty cardinal tetras in a dark, planted aquarium with black substrate is one of the most visually dramatic setups in the freshwater hobby. They need soft, acidic, warm water and are sensitive to poor water quality.