German blue ram

Quick facts

Adult size

5 cm

Lifespan

can live up to 4 years; captive average 2-3 years; commercial stock is line-bred and often weak, quality breeders produce more robust fish

Tank zone

bottom

Temperament

peaceful

Difficulty

intermediate

Water parameters

Temperature

27–30°C

pH

5.0 to 7.0

Hardness

1 to 10 dGH

Tank requirements

Minimum volume

75 L

Minimum length

60 cm

Flow

low

Lighting

dim preferred

Substrate

fine

Driftwood

preferred

Hiding spots

needed

Feeding

Diet: omnivore, feeds primarily at the bottom.

Omnivore with a preference for frozen and live food. Frozen bloodworm, daphnia, brine shrimp, and mysis shrimp should make up the bulk of the diet. Accepts quality pellets and flake but colors are noticeably better on frozen food. Small feedings 2-3 times daily. Rams pick at food deliberately rather than gulping, and may struggle to compete with faster tankmates at feeding time. Bottom-to-midwater feeder.

Compatibility

• Peaceful dwarf cichlid that works in community tanks with non-aggressive fish. Not a bulldozer like larger cichlids.
• Good tankmates: tetras (especially rummynose and cardinal), corydoras, pencilfish, otocinclus, small rasboras.
• Males are territorial during breeding but the territory is small (a 30 cm radius around the chosen spawning site). They display at intruders rather than inflicting damage.
• Do not keep with other rams in a small tank; a pair needs at least 80 L to themselves. Two males in a 60 L tank will result in one being constantly stressed.
• Not suitable for a community tank with boisterous fish (barbs, danios) or competitive feeders.

Habitat

Native to the Orinoco basin in Venezuela and Colombia, specifically the llanos (flooded savanna) where seasonal flooding creates shallow, warm, soft-water pools. Wild fish live in temperatures above 27°C year-round with pH below 6.0. Commercially bred stock (especially the German-line rams, selectively bred in Germany for decades for color intensity) tolerates a slightly broader range but still needs warm, soft water. One of the most colorful freshwater fish available: electric blue body, red/orange belly, black markings through the eye, and iridescent blue speckles. Males are larger with extended dorsal fin rays. Extremely popular in planted tanks and aquascaping for their color and manageable size.

Breeding

Open substrate spawner. The pair cleans a flat surface (rock, leaf, tank glass, or even the substrate itself) and the female deposits 100-300 eggs while the male fertilizes them. Both parents guard the clutch. Eggs hatch in 2-3 days at 28°C; fry become free-swimming after another 3-4 days. First food is infusoria or liquid fry food, then baby brine shrimp. Captive-bred rams are inconsistent parents and often eat their first few clutches. Patience is required; they usually improve after 3-5 attempts. Wild-caught rams are generally better parents.

Common problems

Sensitivity to water quality is the core issue. Rams do not tolerate ammonia, nitrite, or high nitrate. They need mature, well-maintained tanks with warm water (27–30°C). Keeping them at typical community temperatures (24–25°C) shortens their lifespan significantly. Hexamita (hole-in-the-head) is common in rams kept in suboptimal conditions. Commercially mass-bred rams from Southeast Asian farms are often treated with hormones and antibiotics during production, leading to shortened lifespans (12-18 months instead of 3-4 years). Buying from European or local breeders improves the odds. Ich and bacterial infections from transport stress are common in new purchases.

Bioload

Bioload coefficient: 1.6 (small substrate-sifting cichlid; moderate waste output for its size).

Bioload coefficients are calibrated against the neon tetra as the anchor (1.0). See the methodology page for the formula and how each value was derived.

Further reading

• How to cycle a fish tank
• Stocking ideas by tank size