Harlequin rasbora fish are shiny, and they come in shades of reddish-orange and metallic gold or silver. The term “harlequin” comes from the black triangle just below their top fin that ...

Kicking off our list of the best snails for a freshwater tank is the assassin snail. It looks as dangerous as it sounds, with a black and yellow ... Assassins only lay a few eggs at a time ...