Fish & Aquatics

Water quality equipment, including the Marina Submersible Pre-Set Heater 300w and the Supa Algae Magnet, keeps a tropical tank at a stable temperature and helps control the algae that builds up on glass over time. Food ranges by species and location — King British Goldfish Sinking Pellets and Tetramin are aimed at tank fish, while Tetra Pond Fish Food Variety Sticks and Pets Choice Pond Sticks are formulated for pond fish, which have different feeding needs across the seasons.

Decor pieces like the Classic Fluorescent Bridge and gravel such as Roman Gravel Sonic Blue give fish places to shelter and explore, which matters for their wellbeing rather than being purely decorative.

Tropical tank fish generally need a heater to maintain a stable, warmer temperature, along with filtration and a food formulated for their species, whether that's sinking pellets for bottom feeders or a flake food like Tetramin for surface feeders. Pond fish, being outdoors, deal with seasonal temperature swings and eat far less, or not at all, during colder months, which is why pond-specific foods and feeding advice differ so much from tank products.

Water treatment products, like Tetra Pond Aqua Safe and Aquarian Tap Water Safe, condition tap water to make it safe for fish by removing chlorine and other substances harmful to them, and are worth using for both new setups and routine water changes.

New tanks and ponds need to be cycled — allowed to establish the beneficial bacteria that break down fish waste — before adding a full stock of fish, rather than filling up all at once. Regular partial water changes, appropriate filtration for your tank or pond size, and not overfeeding are the three things that do the most for long-term water quality.

If fish are gasping at the surface, unusually lethargic, or showing visible signs of illness, checking water quality is usually the right first step, alongside treatment products like Tetra Pond Medifin where a specific problem has been identified.