Freshwater Fish for Sale UK

A 60L tank comfortably houses around 8–12 small community fish (under 5cm each) such as Neon Tetras, Harlequin Rasboras or Endlers. The old "one inch of fish per gallon" rule is a rough guide at best — bioload, swimming space and social needs matter more than raw numbers. Always cycle the tank first and stock gradually over 4–6 weeks.

Yes. Tropical freshwater fish come from warm tropical rivers and lakes, typically 22–28°C, which is well above UK room temperature. A thermostatically-controlled heater sized at roughly 1W per litre keeps the tank stable year-round and prevents the chilling that makes fish vulnerable to white spot and other disease.

Physically setting up a tank takes an afternoon, but it needs to cycle before you add fish — usually 4–6 weeks for a fishless cycle using ammonia or bottled bacteria. Cycling builds the beneficial bacteria colony that converts fish waste into less-toxic nitrate. Adding fish too early is the single biggest cause of new-tank losses.

The hardiest community beginners are Platies, Mollies, Guppies, Zebra Danios, Harlequin Rasboras, Corydoras catfish and Bristlenose plecos. They tolerate the soft-to-moderate UK tap water found across most of Britain and forgive minor swings in temperature and chemistry while you learn the ropes.

Yes, most community fish get along if they share water parameter preferences, adult size and temperament. Avoid mixing fin-nippers (like Tiger Barbs) with long-finned fish (like Bettas or Angelfish), and never combine predatory and prey-sized fish. Research every species' needs before adding — compatibility charts are a good starting point.

Float the sealed bag in your tank for 15–20 minutes to equalise temperature, then drip-acclimate over 30–60 minutes using airline tubing to match water chemistry. Net the fish into the tank without tipping in the bag water. Keep the lights off for the first few hours to minimise stress.