Cost per litre
Under 1c
Water type
Freshwater
Seachem Fresh Trace
A broad trace element top-up that plain water changes don't fully replace. Seachem Fresh Trace is a freshwater trace element supplement formulated from the ranges identified in the National Academy of Sciences' Nutrient Requirements of Fish as necessary for fish health and growth. It's dosed into the display tank between water changes — a twice-weekly top-up habit rather than a one-off fix — and suits community, planted and African cichlid freshwater setups on a normal water-change schedule.
Key features
- Broad-spectrum blend — calcium, magnesium, iodine, potassium, copper, iron, zinc, manganese, selenium and fluorine in one dose, rather than dosing single elements separately.
- Simple twice-weekly dosing — one capful (5 mL) per 80 L, so a 200 L tank works out to roughly 12.5 mL per dose.
- Doesn't shift your water chemistry — no buffering agents or acids, so pH and KH stay where your other dosing has them, and it won't move GH under normal use.
- Concentrated — under 1c per litre of tank water dosed, across all three pack sizes (see the size comparison below).
- Freshwater-specific formulation — not a shared fresh/marine blend, so nothing is included "just in case" for a saltwater system it will never see.
Specifications
| Element | Guaranteed analysis |
|---|---|
| Calcium | 2.40–2.64% |
| Magnesium | ≥0.792% |
| Iodine | ≥0.1% |
| Potassium | ≥0.1% |
| Copper | 0.032 mg |
| Iron | ≥0.007 mg |
| Zinc | ≥0.007 mg |
| Manganese | ≥0.002 mg |
| Selenium | ≥0.00002 mg |
| Fluorine | ≤0.001 mg |
Which size do I need? — cost per litre dosed
Every dose is 5 mL per 80 L, so a bottle's total working life comes down to how many 5 mL doses it holds. Priced against that, the litre cost barely moves between sizes — all three sit under a cent per litre of tank water dosed, so pick on convenience and how often you want to be re-ordering rather than on unit price.
| Pack size | Doses (at 5 mL) | Litres of tank water dosed | Cost per litre dosed |
|---|---|---|---|
| 250 mL | 50 | 4,000 L | under 1c per litre |
| 500 mL | 100 | 8,000 L | under 1c per litre |
| 4 L | 800 | 64,000 L | under 1c per litre |
Dosage and directions
Shake well. Dose 5 mL (one capful) per 80 L of tank water, twice a week. Scale down for smaller tanks — 40 L takes 2.5 mL, a 200 L tank takes 12.5 mL. Dose the display tank directly; it is not a water-change conditioner and does not need to be added only when you change water.
Suitable for, and not suitable for
Suitable for freshwater community, planted and African cichlid aquariums on a normal dosing and water-change routine. Formulated for freshwater systems only — it is not the marine equivalent, and should not be used to supplement a saltwater or reef tank. Seachem's own guidance treats shrimp and snails as more sensitive than fish to this category of supplement: start at a partial dose and work up to the full rate gradually rather than dosing a shrimp tank at full strength from day one. The copper included is at a low enough level that it is not expected to stress invertebrates at the recommended dose, but a gross overdose should still be avoided.
Care and considerations
It is typically unnecessary to run more than one trace element supplement in the same tank at once — Fresh Trace is safe to use alongside other Seachem freshwater trace products (Cichlid Trace, Discus Trace, Flourish Trace, Gold Trace), but doubling up rarely adds anything. If you also dose a non-Seachem trace supplement, check both labels for overlap and leave a gap between the two rather than dosing them together.
Warranty and delivery
Covered by Seachem's standard product guarantee in addition to your rights under Australian Consumer Law. Standard shipping applies — this is a compact liquid additive with no special freight handling.
Common questions
Will Fresh Trace affect my pH, KH or GH?
No. It contains no buffering agents or acids, so it won't move pH or KH, and the mineral concentration is too low to affect GH under normal dosing.
Is it safe for shrimp and snails?
Yes, at the recommended dose, though Seachem treats invertebrates as more sensitive than fish to this category of product — start with a partial dose and increase gradually rather than dosing a shrimp tank at full strength immediately.
Can I use it in a marine or reef tank?
No. Fresh Trace is formulated specifically for freshwater systems. Marine tanks need Seachem's separate marine trace element product.
Do I still need it if I already dose Flourish?
Usually not both at full rate — running two trace element products at once is typically unnecessary. Fresh Trace is safe alongside other Seachem trace products, but check you're not duplicating the same elements before dosing both.
How long will a bottle last?
At the standard rate of 5 mL per 80 L twice weekly, a 250 mL bottle covers roughly 25 weeks on an 80 L tank; a 4 L bottle covers the same tank for around 400 weeks. Larger tanks use proportionally more per dose, so the bottle empties faster.




