Help me find a fishAnswer four questions about your tank, and skip anything you don’t know.Question 1How big is your tank?Measure the length of the glass, and the depth from front to back. A “60 litre” tank can be almost any shape, so we match fish to its floor space.LengthcmDepthcmor pick the nearestNano30 × 20 cm12 × 8 inStandard60 × 30 cm24 × 12 inFour-foot120 × 40 cm48 × 16 inNot bought one yetwon’t narrow down the resultsQuestion 2Is it heated?An unheated tank stays at the temperature of the room, so you’ll only see species that can be kept in cooler water.Heated22–28 °C72–82 °FUnheatedthe same temperature as the roomDon’t know yetwon’t narrow down the resultsQuestion 3What comes out of your tap?Your water company publishes how hard your tap water is. If you don’t know, you can skip this question.Softunder 8 dGHHard8–15 dGHDon’t knowwon’t narrow down the resultsQuestion 4What are you after?Some fish need to live in a group of their own kind, and others are best kept singly or in pairs. Choose one and we’ll show the species kept that way.A shoala group of one speciesA pairtwo, or one male with several femalesA centrepiecea single fish as the focus of the tankDon’t mindwon’t narrow down the resultsShow me these →Your answers become filters you can change.