Frequently asked questions

Freshwater Diseases

Bulging eye on a Siamese Fighter

Hello, Concerning "kind of disease":there are several possibilities; an injury or (maybe in addition) a bacterial infection of the back of the eye are most likely. Concerning...

Freshwater Fish

Can fish change their gender?

Hello, this actually occurs in some species, it is mainly known from some marine fish, e.g. several wrasses and the well known clownfish. In case of the latter, all fry are born as...

Freshwater Fish

Can I keep Dwarf Livebearers (Heterandria formosa) together with Platies and Corydoras?

Hello, there are no objections against small Corydoras (Corydoras habrosus, C. hastatus and C. pygmaeus) −  however, the aquarium should be abundantly planted and provide a thicket...

Freshwater Care

CO2 dosage

Hello, one bubble per 10 liters (2.2 US gal.) and minute, or 16 bubbles in this case, are a guideline. However, this is really just a rough value, as the actual requirement depends...

Freshwater Care Invertebrates

Continuously rising nitrate and phosphate levels / Snail invasion

Hello, Concerning "phosphate and nitrate levels":these pollution parameters are partially related to pollutants from tap water, but mostly to feeding. They therefore rise quickly,...

Freshwater Fish

Differences between Dwarf Gourami and Honey Gourami (Colisa lalia and Colisa sota/chuna)

Hello, they are two closely related but nevertheless different species: red Dwarf Gouramis are a bred variant of Dwarf Gouramis (Colisa lalia), which in its original form have...

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