Pacu fish (lat. Colossoma macropomum) is a freshwater ray-finned aquarium fishes kind from the subfamily Serrasalminae, Characidae family, or (according to another classification) from Serrasalmidae family, the only kind of Colossoma genus. It is one of the piranha families known for its blood lust. But unlike its “cousins” and despite a strong and massive body, this fish prefers plant food and belongs to the herbivorous class.
Kuhli loach (lat. Pangio kuhlii) is a fish kind of Cobitidae family. This is a peaceful ground fish that is more active in the evening and at night. This is a bright and easy to keep tank fish. As for its disadvantages, these can be its nocturnal habits and wariness. As a result, you may not see it in a tank during the day. Further in the article, you’ll find out how to keep, feed, breed, and choose tank mates for kuhli loach.
The giant gourami (lat. Osphronemus goramy) is the largest fish from all gourami species kept in tanks. In the wild, it can grow up to 60 cm (24 in) long and even larger, according to some data. In tanks, it grows a bit smaller, about 40-45 cm (18 in), but still, it is a very large fish.
The Jack Dempsey fish (lat. Rocio octofasciata, earlier called Cichlasoma octofasciatum) is a widely spread tank fish within North and Central America. Because of the fish’s congenital aggressiveness towards its tank mates, the USA aquarists have called it Jack Dempsey by the popular professional boxer’s name.