Earth Eater (Satanoperca jurupari): Some are small and not overly aggressive, while others will grow into giant fish that will kill anything they see.
Eastern Mudminnow (Umbra pygmea): A freshwater fish with an elongated, stout body, with 10 or more dark, horizontal stripes.
Edible Gourami (Osphronemus gourami): A generally peaceful fish, it's known as a "tankbuster" because it needs a very large. It also requires excellent filtratio and hiding places with plants.
Eduard's Mbuna (Pseudotropheus socolofi): This fish is golden yellow or pale to dark blue to blue, sometimes with faint bands.
Eel Loach (Pangio anguillaris): This fish comes from the tropical waters around Malaysia, Indonesia, and Java. It is very easy to care for.
Egyptian Mouthbrooder (Pseudocrenilabrus multicolor): This mouth-breeding fish takes the eggs into her mouth after spawning. It broods them in a specially modified area of the throat, known as a buccal pouch until they hatch.
Eight-Barb Loach (Lefua costata): This fish likes the company of its own species; keep it company with peaceful, hearty tankmates that require the same water conditions.
Electric Blue Hap (Sciaenochromis ahli): Caves and crevices in rocky terrain provide homes for this fish. It's native to Lake Malawi, Africa, and sports an electric blue color.
Electric Catfish (Malapterurus electricus): The Electric Catfish can generate an electric shock of up to 400 volts using specialized gland cells on the side of their skin. They use these electric impulses to stun their prey, making them easier to catch and kill. However, they are not known to cause human death. The fish also uses its electrical impulses like radar, to get a picture of their underwater environment.
Electric Eel (Electrophorus electricus): Despite its name, it's not actually an eel, but rather a knifefish. It can zap predators and prey with an electrical charge of up to 600 volts. The shock can actually knock a horse over!
Electric Yellow Hap (Labidochromis caeruleus): With proper care, this fish can live up to 10 years! This fish is a mouthbrooder and do well breeding in home aquariums.
Elegant Rasbora (Rasbora elegans elegans): These are strong swimmers and require a large tank. Native to native to Singapore, Malaysia, Borneo, and Sumatra, they are not commonly found in stores or hobbyist aquariums.
Elephant-Nose Cichlid (Nimbochromis linni): Originating from the Niger River in North Africa, the Elephant Nose has a trunk-like extension that it uses to forage for food, defend itself, find its way through the water, and communicate. It is usually a timid recluse and requires a 50-gallon aquarium.