Community aquariums are the most common type of fish tank that people keep. These are normally thought to be smaller tanks that keep peaceful fish in them. The most common aquarium size, the 10 gallon tank (38 L) is just large enough to hold a few peaceful fish that will get along easily together. These often include zebra danios, assorted tetras and some livebearers. The bottom is often patrolled by one of the many armoured cats of the Corydoras species. In some cases there will be an algae eater as well, a small plecostomus or maybe a Chinese algae eater to eat algae growths and hopefully keep the tank bottom spotless.
But there are many types of community aquariums, actually, if you have more than a single fish, the tank is a community. Larger tanks often house many different species, although the community tank style is often continued with peaceful fish co-existing together. There are normally just more of them. Often many added types such as rasbora, gouramies and freshwater sharks wil be seen. As ;long as there is enough room for each specie’s requirements, the community can be stunning, with plenty of activity.
Community Aquariums can hold Aggressive Fish as well
As aquarists become more knowledgeable, they often want to keep something different. As the species kept become larger, there is often greater competition for space, and the result can be some very aggressive communities. In many cases the next distinct community is a Cichlid tank – where the various species of South American OR Africa are mixed together. Cichlids are more aggressive and will not tolerate peaceful fish in many cases. They also seem not to tolerate fish from different continents. The cichlid tanks are often all African Cichlid or all South American varieties. If they are mixed, you will often end up with a single continent fairly shortly.
Other communities are often single species or family tanks. Some fish do better with their own kind. Often barbs do better with their own kind. You can mix a few barb types together, each in its own shoal of 5 or more fish per species. This is much like the Cichlid community aquariums, although barbs often are much less aggressive when they are kept in large enough numbers to be busy keeping their group standings rather than fighting with other species.
I do see particular habitats as a community aquarium, although some may argue that is an aquascape tank, rather than a community one. As long as the fish that are kept come from the same geographical locale, or the same general place such as a river or swift stream, etc. I consider it as a habitat community aquarium. We all have favorites, so often a fish is found in a store that just has to come home with you, even though it does not fit in the habitat as the rest of the species. It may no longer be a habitat community per se, but it has evolved into a personal and unique community that you are now caring for.