The Hydra: A single Hydra in an aquarium is hardly dangerous and fascinatingly. But if they reproduce strongly and appear in measures they can get dangerous for shrimps and young cancers and also young fishes ...

The dragonfly: Mostly the dragonflies are brought into an aquarium by the purchase of new plants without being noticed. They have nested in greenhouses of aquarium plant gardening in the plant roots ...

Plan arias:Plan arias are also told Dugesia gonocephala (triangular head whirl worm), are carnivores and appear both in marine and also in the freshwater. Indeed they prefer cooler waters with strong ...

Snail leech: Hated by many breeders and regarded as snail killers. An abatement through collecting them is pointless because where you can find one you can find several. In opposite to other inhabitants of an aquarium like fishes or shrimps ...

Disk worms: The disk worms are often found at the disks of the aquarium. They live on algae which stick there. To resemble to the appearance they are similar to a thread. They are rather white in color and with 2 mm very short ...

Small jumpers and mussel cancers: Small jumpers and Cyclops (Copepodes) are all the same animals, belong to the small cancers and are related to the water fleas. There are many different types of small jumpers ...