Tropica fertilizer composition

Tropica has 2 brands of liquid fertilizer — Specialised Fertilizer and Premium Fertilizer.

The Specialized fertilizer has N+P (nitrogen and phosphates), while the Premium does not. Unfortunately, not much information is available on the exact ingredients, composition, or percentage of each type of nutrient. For example, it is unclear how much potassium the fertilizers have.

I managed to find the exact composition on the UKAPS forum:

Tropica Fertilizer Composition and Ingredients

Nutrient (w/w%)	Premium Fertilizer	Specialised Fertilizer
Nitrogen	0	1.34
Phosphorus	0	0.1
Potassium	0.8	1.03
Magnesium	0.39	0.39
Sulfur	0.91	0.91
Zinc	0.002	0.002
Molybdenum	0.002	0.002
Boron	0.004	0.004
Iron	0.069	0.069
Copper	0.006	0.006
Fluoride	<0.001	<0.001
Chlorine	0.438	0.5
Manganese	0.039	0.039

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Tropica Specialised Fertiliser – 300 ml

Tropica Plant Growth Premium Fertiliser,300 ml

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Tropica Fertilizer ppm

The composition of ingredients given by Tropica is in w/w% which is weight concentration of a solution. Usually, we want to know the concentration in ppm, or parts per million (equivalently, mg/L).

For that, we can use the Rotala Butterfly calculator. The below information is based on 1 pump (2ml) for a 5 Gallon aquarium.

Your addition of 2 ml (equivalent to 1/4 tsp + 1/8 tsp + 1/32 tsp ) Tropica Plant Growth Premium to your 5gal aquarium adds:

Element	ppm/degree
K	0.845
Mg	0.412
S	0.962
Fe	0.073
Mn	0.041
B	0.004
Cu	0.006
Mo	0.002
Zn	0.002
Cl	0.463

It is quite a “light” dose. Considering that the recommended target concentration of K is 10-30 ppm (from Tom Barr). Singapore water only has on average 1 ppm for K (potassium). Hence, the once a week dose of Tropica fertilizer Premium is definitely not enough to hit 10-30 ppm of K.