Zig-Zag Eel tank mates
Mastacembelus armatus
5 rated pairings from the Zig-Zag Eel care guide. Compatibility here means water, temperament, tank zone and adult size all line up — the note on each card says why. Zig-Zag Eel needs at least 55 gallons on its own; every companion adds to that.
Good matches
3 · Compatible with normal care — watch space and numbers.Striped Raphael Catfish
Platydoras armatulus
50 gal min · 9" adult · Peaceful
Similar nocturnal, bottom-dwelling habits and large adult size; both prefer solitude but can coexist in spacious tanks
Upside-Down Catfish
Synodontis nigriventris
20 gal min · 4" adult · Peaceful
Nocturnal bottom-dweller with comparable size and non-aggressive temperament toward large tankmates
Pacu
Colossoma macropomum
500 gal min · 42" adult · Semi-aggressive
Large, robust fish that occupies different water column; requires similarly spacious tank and won't compete for bottom space
Use caution
2 · Works in the right setup; read the note before combining.Silver Dollar
Metynnis argenteus
55 gal min · 6" adult · Peaceful
Mid-water swimmer that avoids the eel's territory; large enough to not be predated upon, but monitor for stress
Rope Fish
Erpetoichthys calabaricus
55 gal min · 15" adult · Peaceful
Another large eel species with similar burrowing behavior; may compete for space and hiding spots in even large tanks
Planning this tank?
Run the whole stock list through the calculator — it checks bioload and schooling numbers, not just pairings.