[header] How to keep peacock eels [title] Choose a fish tank. [step] Peacock eels need a decent amount of space in their tank to swim and for vegetation. They need a fairly large tank in order to thrive, so you may need to consider how many eels you want before choosing a tank. 
[substeps] Peacock eels do best in tanks that hold 35 gallons of water or more. A good rule of thumb is to have a tank large enough to have one gallon of water for each inch of full grown eel that will inhabit it.