Fish that are called 'eels' have a long snake-like body. Most are without a separate dorsal and pelvic fin, rather their fins appear merge together with the tail fin to form a continuous fin fringe. Most also have small gill opens, often just a single gill slit at the throat. Eels vary in size but the average size of most species is from between 12 - 36 inches (30 - 90 cm) in length. In their native regions many of these fish are considered a good tasting food.
There is only one order of fish classified as true freshwater eels, this is the Anuilliformes Order of eels.
Aquarium eels also include many so-called 'freshwater eels' that are not true eels. Yet they are all commonly called "eels" in the aquarium industry. Other Eel-type fishes include:
Finally there are some fish that are often referred to as eels but that are not. These fish don't usually have the word 'eel' in their common name. These include such critters as Bichers and Ropefish, Knifefish, Eel Catfish, Lungfish, and Slimy Eels. Most of these are included in their own categories, see: Bichers and Ropefish, , , and to find them.
Best Fish for a Small Tank | PetHelpful
Let’s just face it: small things are cute and tiny things are even cuter. This list encompasses my favorite 11 nano species for freshwater tanks. None of the fish on the list require a tank larger than 10 gallons and majority of them can live happily in even 5 gallons.
It is important to house tiny fish with other tiny fish. The majority of the species on this list are shy, timid, and very peaceful. They can easily be out-competed for food and stressed out if placed in aquarium with larger, more boisterous tankmates. Nearly every fish on this list could live happily together in a 10 to 20 gallon aquarium except one, the pea puffer. Pea puffers can be nasty little buggers and would be best suited in a tank all on their own.
Semi-Aggressive Freshwater Fish for a Tropical Aquarium
Unlike other freshwater fish, sharks do not react to other tank mates, instead; they react to the physical environment. This could take a few weeks or more, depending on the plants and decorations in the tank. Although they are quite active, it does take a new shark a substantially longer time to become comfortable in its new environment than most other fish, and a pet owner may not see their shark for quite a long time. Once a shark has become comfortable it will claim a territory and generally stay in this area. If the tank is small, the fish may try to claim the entire aquarium and become aggressive or, at the least, start fin nipping. If you are planning to keep a shark in a smaller aquarium (under 55 gallons) it should be kept with fast swimming fish and fish without long fins.
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