Green Hydra (Chlorohydra viridissima) – Species Profile

Freshwater Hydra (Hydra viridissima)

Chlorohydra viridissima (aka Green Hydra, or just Hydra) are a species of freshwater cnidarian, common to waterways all over the world. They have an interesting green color, which comes from their symbiotic relationship with green algae. Hydra are fascinating little creatures, but can be the bane of fish breeders everywhere, because of their stinging tendrils. Perhaps the most unbelievable trait attached to these creatures is that some believe they are potentially immortal.

Care Level: “Where did these come from? ” Easy
Preferred Water: Wide range of pH and water hardness
Ideal Temperature: Temperate to Tropical
Maximum Size : 30 mm
Average Lifespan: 8 years to Forever!

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Freshwater Amphipod – Species Profile

Freshwater Amphipod “Scud”. Source: wikimedia.

Also called “scuds” or “side-swimmers”, amphipods is a collective term for many species of aquatic crustaceans. Many amphipods you will find in the freshwater aquarium hobby are of the genus Gammarus or Hyallela. There are also numerous saltwater species.

Care Level: “Where did these come from?” Easy
Preferred Water: pH 6 to 8, soft to hard
Ideal Temperature: 65 to 75 °F (12.8 – 22.2 °C)
Maximum Size (depending on species) : 0.25″ to 0.5″ (6.35 mm to 12.7mm)
Average Lifespan: 1 to 1.5 years

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Freshwater Cyclops – Species Profile

Female freshwater Cyclops. Source: wikimedia.

“Cyclops” is a common genera of copepod organisms found in freshwater habitats. The name comes from the mythical Greek creature, known for having only one eye, a characteristic shared by these minute creatures. Under magnification, this eye can be easily seen as a large red or black dot on the head. Cyclops are easy to spot on aquarium walls as tiny, white, tadpole-shaped specks that move in quick, jerky movements.

Care Level: Easy
Preferred Water: pH 6 to 8, soft to hard
Ideal Temperature: 64 to 72 °F (12.8 – 22.2 °C)
Maximum Size: 0.5mm to 5mm, depending on species
Average Lifespan: 3 months

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