Flourish vs Tropica: Premium and Specialised are different products
By Richard James · Manufacturer sources checked · 28 October 2026
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Quick answer
“Tropica fertiliser” is not one product. Identify Premium or Specialised before comparing its nutrient role with Flourish.
The distinction that changes the comparison
| Formulation | Important declared distinction |
|---|---|
| Tropica Premium | No nitrogen or phosphorus in its declaration |
| Tropica Specialised | Includes nitrogen and phosphorus |
| Flourish | Not a substantial nitrogen/phosphorus source |
The same liquid reference does not mean identical nutrients
Tropica lists 6 mL per 50 L weekly as its starting reference for these liquids, adjusted to plant requirements. A matching volume and pump count do not make their analyses interchangeable. Specialised explicitly warns that nutrient supply can also promote existing algae growth.
Which fits the aquarium?
Record what fish feeding, source water, substrate and the existing routine already contribute. Avoid choosing by bottle colour or brand claims alone. Do not automatically halve another product because you changed to a Tropica bottle.
Use a formulation-specific tool
Flourish · Tropica Premium · Tropica Specialised. Keep any manufacturer adjustment separate from the standard arithmetic.
Keep the result in context
Use actual water volume and the exact schedule. Do not equate the liquid millilitres with active nutrient mass. Read units and concentration and schedule changes before comparing a daily and weekly routine.
Sources and check scope
Sources checked 28 October 2026. Manufacturer product information and scoped instructions; no independent efficacy or clinical review. This source check was assisted by AI; it is not an independent human expert or veterinary review. Match the exact pack and consult its manufacturer if directions conflict.