The key to keeping ember tetras and guppies thriving in a community is good water quality. Both are tropical fish that live in freshwater aquariums with no traces of ammonia or nitrite.

To marine biologists, the guppy (scientific name ... is one of the world’s most popular tropical fish and one of the most widely distributed freshwater aquarium fish species.

Guppies are small ... such as otocinclus catfish or small loaches. While most freshwater aquarium fish prefer warmer tropical water conditions, the white cloud mountain minnow originates in ...