Frozen bloodworm has to be thawed, handled and stored, which is exactly the faff a jelly-based sachet is built to remove — the whole selling point here is treating fish to bloodworm without touching it or keeping a freezer bag on hand.

Tetra's Delica Bloodworm comes in individual sachets, sixteen to a pack at 3g each. Tetra state there's no risk of introducing disease compared with frozen food, since the sachets never need thawing, and the nutrient-enriched jelly is designed not to cloud the water.

• 16 sachets, 3g each
• No thawing needed, unlike frozen bloodworm
• Tetra state no disease risk compared with frozen food
• Also suitable for marine fish and goldfish, not tropical fish alone
• Complementary treat, fed every few days alongside a staple food

One thing worth knowing. This is a treat, not a staple diet — Tetra's own guidance is to feed it every few days in addition to a fish's regular food, not as a replacement for it, so it shouldn't be making up the bulk of what a fish eats.

Who it's for: keepers of tropical fish, marine fish or goldfish who want an easy, mess-free way to offer bloodworm occasionally without handling or thawing frozen food.