• 10,000 mg/L ferrous iron - a concentrated source of iron already in the ferrous (Fe2+) form, the form plants take up directly.
• Immediate and time-released iron together - ferrous gluconate acts straight away, and a slow-release component keeps iron available between doses.
• Built-in reducing agent - converts any ferric iron already in the tank back to the ferrous form plants can use.
• Treats water for under 1c per litre - the 350 mL bottle doses out to roughly 14,000 litres of treated aquarium water over its life.
• No CO2 system required to see the benefit - iron deficiency shows up as pale new leaves even in a well-lit, well-fertilised tank, and this addresses that specific gap.

Use the 7 mL cap supplied with this 350 mL bottle. Dose 7 mL per 280 L (70 US gallons) of aquarium water, three times a week, or as needed to hold iron at around 0.10 mg/L. Shake before use. Increase or reduce the dose to match how quickly your plants are drawing iron down - fast-growing stem plants under strong light use it faster than a lightly planted community tank.

A liquid iron test kit is the only reliable way to know where your tank actually sits between doses; visual symptoms lag behind the numbers by several days.

At 7 mL per 280 L, one 350 mL bottle doses out to roughly 14,000 litres of treated aquarium water before it runs out. At $49.95 a bottle, that works out to treating water for under 1c per litre - the concentration is what makes the low running cost possible, since a weaker iron solution would need far more mL per dose.

Suitable for: planted freshwater aquariums showing pale or yellowing new leaves, tanks running CO2 and high light where plant growth quickly draws iron down, and any freshwater setup on a regular fertiliser routine.

Not suitable for: reef and FOWLR marine tanks, where dosed iron has no established role in AquaVitro's own product information. Use a marine-specific trace element supplement instead in those systems.

Overdosing iron can encourage algae growth rather than plant growth, since algae will use any iron plants don't. Dose to the schedule and test rather than adding extra "to be sure." Keep the bottle away from unsupervised aquariums with grazing invertebrates that may be sensitive to concentrated trace elements.

• A liquid iron test kit, to confirm the 0.10 mg/L target is being held between doses rather than assumed.
• A broader macro-nutrient fertiliser (nitrogen, phosphorus, potassium), since iron alone will not fix a tank that's also short on the bulk nutrients plants need.
• CO2 injection equipment, where light and iron are already in place and carbon is the next limiting factor for growth.

AquaVitro does not publish a warranty term for its liquid supplements; your rights under the Australian Consumer Law apply regardless of anything the manufacturer does or doesn't state. This is a standard 350 mL liquid and ships as a normal parcel - no special freight class applies.

How do I know if my plants are iron deficient?

The classic sign is interveinal chlorosis on new leaves - the leaf turns pale or yellow while the veins stay green - because iron doesn't move from old growth to new growth inside the plant the way some other nutrients do.

Can I dose this alongside CO2 and other fertilisers?

Yes. Propel supplies iron only, so it's designed to be dosed alongside separate macro-nutrient fertilisers and CO2 rather than replacing them.

Will this discolour my water?

Concentrated iron supplements can tint water very slightly for a few hours after dosing, which clears as it's taken up or filtered. It is not a sign the dose was wrong.

Is this reef safe?

AquaVitro markets Propel as a planted freshwater product, not a reef supplement, so we can't confirm a safe dose for invertebrates or corals and don't recommend using it in a marine system.