• Five named marine ingredients — artemia, rotifers, squid, cockles and krill, with no fillers, binders or vegetable matter in the declaration.
• A genuine particle-size range — rotifers are the smallest item in the mix and krill the largest, so small and large mouths are both served by one cube.
• Two mollusc sources — squid and cockles, which sit apart from the crustacean fraction and suit fish that prefer soft flesh.
• 9.0% crude protein at 86.5% moisture — the highest water content of the six frozen foods compared below, which is why the protein figure reads low against the cube diets.
• No added colour, no premix declared — unlike the Formula cubes, this is a straight mix of five marine items.
• Reduces the number of packs in the freezer — one blister rather than five separate single-item foods.

Reproduced verbatim from Ocean Nutrition's published composition, in the manufacturer's own order. Checked 7 August 2026.

Artemia, rotifers, squid, cockles, krill

Allergen, additive and source notes

• Contains crustacean (artemia, krill) and mollusc (squid, cockles) derivatives. Rotifers are zooplankton and are not a named allergen group.
• No preservatives, antioxidants, added colours or vitamin premix are declared.
• No fish fillet, no algae and no plant matter appear in the declaration.

Figures are as fed, on the frozen product, as published by Ocean Nutrition.

Read the protein figure alongside the moisture figure. At 86.5% water, 9.0% protein as fed is roughly 67% on a dry-matter basis — lower than the Formula cubes, but this is a variety food rather than a growth diet.

A mixed marine community rarely eats one particle size. Cardinals and small clowns take fine items, wrasses and larger angels want something they can bite, and a tank with both usually ends up with one group underfed at every feed.

Marine Quintet handles that by putting the range into one cube. The trade-off is control: you cannot dial up the krill fraction for a hungry wrasse or drop the artemia for a fish that ignores it. Keepers with a single-species tank are usually better served by a single-item food.

Protein figures below are as fed, from each product's own published analysis.

If your tank is freshwater rather than marine, the equivalent mixed product is Frozen Tropical Quintet.

Ocean Nutrition's published directions are to feed two to five times a day, and to feed only the amount the fish will consume within five minutes.

• Break off a cube and return the blister to the freezer immediately.
• Drop the cube into flow rather than into a still corner, so the lighter items — the rotifers and artemia — disperse to the fish that need them instead of settling.
• Remove uneaten food after five minutes.
• Watch which fraction is left behind. If the krill is consistently ignored, your stock is telling you it wants a finer food.

Suitable for

• Mixed marine community tanks with a spread of fish sizes.
• Marine fish that have gone off a single food and need variety to start feeding again.
• Keepers who would rather store one blister than five separate single-item packs.
• Ornamental shrimp and crabs, which will take the fractions that reach the substrate.

Not suitable for

• Strict herbivores as a diet. There is no algae or plant matter in this product at all — tangs and rabbitfish need Formula Two or a dried algae sheet.
• A complete sole diet. No vitamin or mineral premix is declared, so rotate it with a formulated food.
• Seahorses and pipefish as a primary food. They feed best on a consistent, correctly sized item rather than a mix — use frozen mysis.
• Freshwater tanks. Ocean Nutrition lists this as a marine product; Tropical Quintet is the freshwater equivalent.

• Keep frozen in a domestic freezer, and return the blister as soon as you have taken a cube.
• Do not refreeze cubes that have fully thawed. Discard them.
• A mixed food suffers more than a single-item food from repeated thawing, because the finer fractions break down first and you end up feeding an increasingly krill-heavy cube.
• This is a frozen product that must stay frozen in transit, so it is handled as a cold-chain item rather than an ordinary parcel.

• Frozen Formula One 100g — a formulated diet with a full vitamin premix, to rotate against this unfortified mix.
• Green Seaweed — covers the plant side that Marine Quintet does not address at all.
• Frozen Mysis Flat 454g — a consistent small particle for the fish that only pick the fine fraction out of the mix.
• Frozen Rotifers 100g — the smallest item in the Quintet on its own, for fry and very small-mouthed fish.

Frozen foods are a consumable and carry no manufacturer warranty period. Your rights under the Australian Consumer Law apply in full and are in addition to anything stated here, including the guarantee that goods are of acceptable quality and fit for their stated purpose.

If a frozen order arrives soft or thawed, contact us before feeding it and keep the packaging.

What is actually in Ocean Nutrition Marine Quintet?

Five marine ingredients: artemia, rotifers, squid, cockles and krill. That is the complete published composition — there are no binders, fillers, colours or added vitamins in the declaration.

Why is the protein only 9%?

Because the moisture is 86.5%, the highest of the six frozen foods compared above. On a dry-matter basis it works out around 67%. It is a variety food rather than a growth diet, and the low figure is a consequence of water content, not poor ingredients.

Is Marine Quintet a complete diet on its own?

No. It carries no declared vitamin or mineral premix and no plant matter, so it is best rotated with a formulated cube such as Formula One and, in a tank with grazers, an algae sheet.

What is the difference between Marine Quintet and Tropical Quintet?

Marine Quintet is formulated for saltwater fish and Tropical Quintet for freshwater tropicals. Check the composition on each page before substituting one for the other, as the five ingredients differ.

Will corals feed on Marine Quintet?

The finer fractions that escape the fish can be captured by larger-polyp corals, but this is not a coral food and is not sold as one. A dedicated small-particle coral food is the right product for that job.

Should I thaw Marine Quintet before feeding?

Ocean Nutrition does not publish thawing directions for this product. Feeding the cube frozen into flow works well and keeps the fine fraction suspended; thawing and rinsing in a net reduces the nutrient load but also washes away some of the smallest items.