Fish left over a weekend are not actually at risk of starving — they can go far longer than most owners assume — but a tank with nobody watching it is still a tank nobody is watching, and a feeding block closes that gap without a timer or a helpful neighbour.

The block is designed to dissolve slowly, releasing food particles as it goes rather than all at once, and it is built to supplement rather than replace an established feeding routine. Supa's own guide is one block in a 45 litre (10 gallon) aquarium, sufficient for 10–15 average fish for 3–4 days, and they note the water temperature range it assumes is 20–25°C.

• Protein 40%, fat 8%, fibre 2%
• Slow-releasing block, not a flake or pellet
• Guide dose: one block per 45 litre (10 gallon) tank
• Feeds roughly 10–15 average fish for 3–4 days
• Assumes a water temperature of 20–25°C
• Not suitable for marine tanks

On the temperature. Supa's own guidance is specific that lower temperatures or highly alkaline water will slow how the block dissolves, and higher temperatures will speed it up — so the 3–4 day figure is a guide for their stated conditions, not a guarantee for every tank. Made in the UK.

Who it's for: freshwater cold water and tropical fish keepers going away for a long weekend, who want a stopgap feed rather than a full holiday-length solution.