Species profile
Peacock Eel
Macrognathus siamensisPeacock Eel (Macrognathus siamensis) is a large aquarium species for a cycled 55+ gallon freshwater aquarium. Plan for about 12 inches as an adult, 75-82°F water, pH 6.5-7.8, and advanced care. Match tankmates by water range, adult size, activity level, and feeding needs.
Community leaningAdvanced care
55 galMinimum tank
12 inAdult size
1Schooling minimum
75-82°FTemperature
Water Range
- pH
- 6.5-7.8
- GH
- 5-15 dGH
- KH
- 2-10 dKH
Behavior
- Temperament
- Peaceful
- Fin nipping
- 0/5
- Territory
- 1/5
Diet and Care
- Diet
- carnivore
- Diet difficulty
- 3/5
- Care difficulty
- 4/5
Planning Notes
Predatory or specialist fish; plan for adult size, secure lids, and meaty feeding needs.
This species may need live, frozen, fresh, or otherwise specialized foods.
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These matches are starting points with overlapping water ranges and lower behavior risk. Always check the full stocking plan, tank size, and group counts before buying.
Run Peacock Eel through the checker with your tank size, cycle status, water, group count, and tankmates before buying.
Check my tankCompare this speciesPut Peacock Eel beside another profile to compare water range, size, diet, schooling needs, and behavior.
Open comparisonWill plants work?Match Peacock Eel against aquarium plants for nibbling, uprooting, cover, flow, and water-range flags.
Open plant matchAsk about my setupAsk Advisor how Peacock Eel fits with your current tank, recent logs, plants, and livestock.
Ask AdvisorView native rangeOpen the origins map to see reviewed native-range coordinates and regional context for Peacock Eel.
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