Seachem Flourish

50 mL

$12.95

Sold Out

Pack size

50 mL

Cost per litre

Under 1c

Water type

Freshwater

Seachem Flourish

$12.95

Sold Out

50 mL 100 mL 250 mL 500 mL 2 L 4 L

Feeds the trace elements a planted tank strips out of the water column.

Seachem Flourish is a comprehensive supplement of trace and micro elements – iron, manganese, boron, zinc and more – for freshwater planted aquariums, dosed once or twice a week to replace what fast-growing plants consume. It carries calcium, magnesium and potassium too, without the heavy nitrogen or phosphate load of a fish-food-driven tank.

Key features

Broad trace-element base – iron, manganese, boron, zinc, copper, cobalt and molybdenum in one dose, plus calcium, magnesium and potassium.
Low nitrogen and phosphate – 0.07% total nitrogen and 0.01% phosphate, so it won't feed algae the way a nitrogen-heavy fertiliser can.
Shrimp-safe at the recommended dose – used across community and shrimp-keeping planted tanks.
Concentrated – a 50 mL bottle treats roughly 2,500 L across its dosing life, working out to under a cent per litre.
Part of a modular system – pairs with Flourish Excel for a carbon source and Flourish Tabs for root feeders, so dosing can be tuned per tank.

Specifications

Pack size	50 mL / 100 mL / 250 mL / 500 mL / 2 L / 4 L
Form	Liquid concentrate
Water type	Freshwater, planted
Derived from	Potassium chloride, calcium chloride, copper sulphate, magnesium chloride, ferrous gluconate, cobalt sulphate, magnesium sulphate, manganese sulphate, boric acid, sodium molybdate, zinc sulphate, protein hydrolysates
Guaranteed analysis (per g)	Total nitrogen 0.07% · Phosphate 0.01% · Potassium 0.37% · Calcium 0.14% · Magnesium 0.11% · Sulphur 0.2773% · Boron 0.009% · Chlorine 1.15% · Cobalt 0.0004% · Copper 0.0001% · Iron 0.32% · Manganese 0.0118% · Molybdenum 0.0009% · Sodium 0.13% · Zinc 0.0007%
Standard dose	5 mL (1 capful) per 250 L, once or twice weekly
Storage	Refrigeration recommended from 3 months after opening

Which size do I need?

Pack	Water treated per dose cycle	Cost per litre treated
50 mL	2,500 L	under 1c per litre
100 mL	5,000 L	under 1c per litre
250 mL	12,500 L	under 1c per litre
500 mL	25,000 L	under 1c per litre
2 L	100,000 L	under 1c per litre
4 L	200,000 L	under 1c per litre

Every size works out to a fraction of a cent per litre dosed – the deciding factor is tank size and how often the bottle gets used before the cap thread clogs, not price per litre.

Suitable for, and not suitable for

Suitable for: freshwater planted aquariums, community tanks with live plants, tanks also keeping shrimp at the recommended dose.
Not suitable for: fish-only tanks with no live plants – the trace elements have nothing to be taken up and will simply accumulate.

Dosage and directions

Add 5 mL (1 capful) per 250 L, once or twice a week.
Each thread of the cap holds roughly 1 mL, for finer dosing in smaller tanks.
Refrigerate the bottle from 3 months after first opening.

Safety

Aquarium use only – keep away from children. Contains 1,5-pentanedial (a preservative), which may cause an allergic reaction on skin contact; rinse off if it happens.

Goes well with

Seachem Flourish Excel – a liquid carbon source that pairs with Flourish's mineral dose rather than duplicating it.
Seachem Flourish Tabs – root tabs for heavy root feeders that Flourish's water-column dosing doesn't reach.
Seachem Flourish Potassium – for tanks that need extra potassium beyond what Flourish alone supplies.
Seachem Equilibrium – raises general hardness in RO/RO-DI setups, complementing Flourish's trace-element dose.

Warranty and delivery

Covered by Seachem's standard manufacturer warranty in addition to your rights under Australian Consumer Law. Standard freight for bottles up to 500 mL; the 2 L and 4 L sizes ship as a standard parcel, no special handling required.

Common questions

Will Flourish feed algae?

At the recommended dose it's unlikely to – nitrogen and phosphate are both under 0.1% of the formula. Algae blooms in planted tanks are far more often light or CO2 related than caused by trace-element dosing.

Do I still need a separate iron supplement?

Flourish already contains iron (0.32%), but heavily planted or high-tech tanks often run through it fast – Flourish alone is usually enough for low-to-medium light setups, with Flourish Iron as a top-up for demanding ones.