JBL vs Tropica vs Seachem Fertiliser Comparison Guide: NPK Profile
Three fertiliser brands cover the bulk of planted tanks in Singapore, and each takes a different philosophical approach to feeding aquatic plants. The jbl vs tropica vs seachem fertiliser question matters because the dosing schedule you adopt today shapes algae behaviour for the next year. This guide from Gensou Aquascaping at 5 Everton Park breaks down the NPK profiles, dosing complexity and per-month costs of the JBL ProScape line, Tropica’s two-bottle range, and the Seachem Flourish family using Singapore PUB tap as the baseline.
JBL ProScape: The Modular German System
JBL splits its planted-tank range into separate macro and micro bottles plus dedicated NPK and Fe boosters. ProScape NPK Macroelements supplies nitrogen, phosphorus and potassium at roughly 7-1.4-7 per millilitre, while ProScape Trace Elements covers iron and the seven essential micros. The system is designed for regular water changes and weekly dosing rather than daily micro-management. Singapore retail sits at SGD 28-35 for the 250ml NPK bottle and SGD 28-38 for the trace bottle. Browse the full aquarium fertiliser range for stock. Best for scapers who want a clear macro-micro split and are happy following the JBL dosing chart.
Tropica Specialised and Premium: The Two-Bottle Simplicity
Tropica’s range is the easiest to learn. Specialised Nutrition combines macros and traces in one bottle for tanks with fish (relying on fish waste for additional nitrogen), while Premium Nutrition skips the nitrogen entirely for tanks that already have nutrient-rich substrates. The NPK in Specialised reads roughly 1.5-0.4-3, low compared to JBL but designed to layer over substrate ammonia leach. SGD 30-38 for the 300ml bottle. The trade-off is less dosing precision — you cannot tune N independently of K — but for 90 per cent of community planted tanks this hands-off approach prevents over-dosing and the algae that follows. Try the Tropica Specialised 300ml for a balanced default.
Seachem Flourish Line: The Modular Maximalist
Seachem takes modularity to the extreme. Flourish Comprehensive (the trace mix), Flourish Nitrogen, Flourish Phosphorus, Flourish Potassium and Flourish Iron are all sold separately. This lets advanced scapers tune N:P:K ratios precisely against ICP test results, which matters in high-tech tanks pushing 100 µmol PAR. The drawback is shelf real estate — five bottles instead of two — and the cost per ml runs higher. Singapore retail averages SGD 18-22 per 250ml bottle, so a full setup costs SGD 90-110 upfront. Reach for Seachem when you have grown out of single-bottle solutions and need a tunable EI-style dosing scheme.
NPK Profile Side-by-Side
Per millilitre dosed to a 100-litre tank, JBL ProScape NPK delivers approximately 0.07 ppm N, 0.014 ppm P, 0.07 ppm K. Tropica Specialised at the same volume gives 0.015 ppm N, 0.004 ppm P, 0.03 ppm K. Seachem Nitrogen alone delivers 0.15 ppm N. The headline: JBL is roughly 4x stronger than Tropica per ml on macros, while Seachem solo bottles are stronger again but require multi-bottle dosing to balance. None is wrong; they target different tank densities and dosing philosophies.
Dosing Complexity and Schedules
Tropica wins on simplicity — one cap, twice a week, done. JBL needs two pumps and an ironing-out reading at least monthly with a drop test. Seachem demands five bottles, a calculator (or Rotala Butterfly), and weekly testing of NO3 and PO4 to stay balanced. For beginners on community tanks, the Tropica path eliminates the most common mistake: over-dosing. For advanced scapers chasing colour-up in Ludwigia palustris or Rotala macrandra, the Seachem precision pays off.
Singapore PUB Tap Compatibility
Singapore tap is soft (GH 2-4, KH 1-2) and low in nitrate. This actually favours the higher-N profile of JBL or Seachem because Tropica Specialised assumes incoming nitrate from heavy fish stocking. Lightly stocked tanks on Tropica alone can show nitrogen deficiency — pale new growth, holed older leaves on Echinodorus — within two months. If you run Tropica, supplement with weekly water changes from water conditioners and feed the fish generously.
Cost Per Month and Verdict
For a 100-litre planted tank dosing standard volumes, JBL averages SGD 12 per month, Tropica SGD 8, Seachem SGD 15-18. Tropica wins on absolute cost and effort. JBL wins on the macro-micro balance for medium-tech tanks. Seachem wins for advanced ICP-led precision dosing. Pair any of these with pressurised CO2 for the full uptake response.
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