Rope fish, Erpetoichthys calabaricuscan - can be a great addition to any large aquarium with proper care. Rope fish should be in a minimum 300 liter (75-80 gallons) tank. Rope fish are very social and do best in the company of their own species. They do best in groups of 5 or 6.
They can grow to be 90 cm in the wild, but in capitivity, 16 inches is average. They will do fine with any fish bigger than their mouths, anything smaller will most likely be eaten up! They can be fed a large variety of items: beefheart, bloodworms, earthworms, frogs, crabs, shrimp, feeder fish, etc...anything meaty.
They should not be kept with belicose species such as with oscars, red devils, or any other predatory/territoral type large fish. Ideal temperature should be between 22-26°C but fair well in warmer temps, and pH level slightly acidic at 6.5-7.5. Rope fish are fairly hardy. There have been no recorded cases of them breeding in captivity.
They do require some hiding place like rocks, plants and caves. Also sexing ropefish is fairly easy. Males have more "spikes" on their top fins than females, and they appear to be more olive in color. Males generally have between 9-12 "spikes" and females less then 10 with a more of ochre color.