Rainbow Shark — Fish Profile
Epalzeorhynchos frenatum
Quick Specs
| Adult Size: | 6.0" |
| Temperament: | semi-aggressive |
| Care Level: | intermediate |
| Min Tank Size: | 55 gallons |
| Temperature: | 75-81°F |
| pH Range: | 6.5-7.5 |
| Diet: | omnivore |
| Origin: | Southeast Asia (Thailand, Myanmar) |
| Lifespan: | 5-8 years |
Overview
Rainbow Sharks are striking bottom-dwellers with a dark body and vivid red-orange fins. Despite the name, they are not true sharks — they are cyprinids related to barbs and danios. They are territorial toward their own kind and similar bottom-dwellers but generally leave mid-water fish alone. Provide a large tank with caves, driftwood, and a smooth substrate.
Care Guide for Rainbow Shark
Tank Setup
Rainbow Shark requires a minimum tank size of 55 gallons. Maintain water temperature between 75°F and 81°F, with a pH range of 6.5 to 7.5. A properly sized tank with adequate filtration and regular water changes is essential for long-term health. When housing Rainbow Shark with other species, always choose a tank size that accommodates the most demanding fish in the community.
Feeding
Rainbow Shark is a omnivore feeder. Provide a varied diet appropriate for omnivore species to ensure optimal health and coloration. Feed small portions 2–3 times daily, and remove uneaten food after a few minutes to maintain water quality.
Temperament & Compatibility
This species is classified as semi-aggressive. Rainbow Shark reaches an adult size of 6.0 inches and has a care level of intermediate. Always research compatibility before adding new fish to an established aquarium. Individual temperament can vary, so monitor new introductions closely for the first 48 hours.
Origin & Lifespan
Rainbow Shark originates from Southeast Asia (Thailand, Myanmar) and has an expected lifespan of 5-8 years when kept in proper water conditions with appropriate tank mates and diet.
Compatible Tank Mates
🟢 Good Tank Mates
🟡 Caution Tank Mates
🔴 Risky Tank Mates
Compatibility Results for Rainbow Shark
All 69 compatibility checks involving Rainbow Shark:
Recommended for Rainbow Shark
Fluval Flex Aquarium Kit — $149.9957-gallon aquarium suitable for rainbow sharks
Expert Care Tips for Rainbow Shark
- Large tank required: At 55+ gallons, Rainbow Shark needs serious equipment investment. Ensure your filter is rated for at least 1.5× the tank volume.
- Tropical range: Keep Rainbow Shark at 75–81°F. A 50W heater per 10 gallons is a safe rule of thumb for stable temperature.
- Narrow pH tolerance: Rainbow Shark only tolerates pH 6.5–7.5. Test your tap water before buying — adjusting pH is harder than choosing the right fish for your water.
- Semi-aggressive temperament: Rainbow Shark is generally peaceful but can become territorial. Provide ample hiding spots and avoid housing with fin-nipping species.
- Acclimation: Always drip-acclimate Rainbow Shark over 30–45 minutes. Match temperature and pH gradually to prevent osmotic shock.