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.
Fire eel (Mastacembelus erythrotaenia) resembles a true eel, that’s why the fish got its name. However, this fish has nothing in common with eels despite its snake like body and pointed snout. This is a renown tank and commercial fish.