Baja Pokok Aquascape: Liquid Fertiliser vs Root Tabs for Malaysian Planted Tanks

Which baja pokok aquascape you need depends on how your plants feed: plants that take nutrients through their leaves (stem plants, mosses, anubias, java fern, floating plants) need liquid fertiliser in the water, while heavy-rooted plants (cryptocoryne, Amazon swords, vallisneria) need root tabs pushed into the substrate. Most tanks with a mix of plants do best with a little of both. In a low-tech tank without CO2, dose lightly: about once a week, after the water change. This guide explains NPK and iron, how to dose, how to read deficiency signs, and how to keep shrimp safe.

(Indonesian pages call aquarium fertiliser pupuk aquascape. In Malaysia, the word is baja.)

Why Your Plants Need Baja Pokok Aquascape

Fish waste and fish food supply some nutrients, mainly nitrogen and phosphate. But plants also need potassium, iron and trace elements that fish waste doesn't provide in enough quantity. Malaysian tap water is generally soft, so it doesn't bring much in the way of minerals either. Signs your plants are hungry: pale new leaves, holes, yellowing and slow growth, often with algae moving in.

The Nutrients That Matter

Nutrient	Role	Where it usually comes from
Nitrogen (N)	Leaf and stem growth	Fish waste; "macro" or "NPK" fertiliser
Phosphorus (P)	Energy, roots, growth	Fish food; macro fertiliser
Potassium (K)	Overall health, strong leaves	Fertiliser (fish waste supplies little)
Iron (Fe)	Green colour, red colour in red plants	Fertiliser; iron-rich aquasoil
Trace elements (Mn, B, Zn, Mo, Cu…)	Small but essential roles	"Micro" or "complete" fertiliser
Carbon (CO2)	Building block of the plant	Air at the surface, fish breathing, injected CO2

Complete or "all-in-one" fertilisers combine macros and micros in one bottle and suit most beginners.

Liquid Fertiliser vs Root Tabs

	Liquid fertiliser (baja cecair)	Root tabs (baja akar / tablet)
Feeds	Water column, absorbed by leaves	Substrate, absorbed by roots
Best plants	Stem plants, mosses, anubias, java fern, buce, floating plants	Cryptocoryne, swords, vallisneria, sagittaria, lilies
Dosing	Weekly (low-tech) or several times a week (CO2 tanks)	Every 1–3 months, near each root-feeding plant
Pros	Fast, even spread, easy to adjust	Targeted, doesn't feed algae as much
Cons	Overdosing can feed algae	Fiddly; can release into water if pushed in shallow
Good for low-tech?	Yes, at low doses	Yes, especially in sand or gravel

Root tabs matter most in inert sand or gravel, which hold no nutrients. Aquasoil contains nutrients at first, but these run down after a while (commonly quoted as several months to a year), and root tabs then help. See our guide on aquarium soil.

Browse liquid fertilisers and root tabs in Fertilizers. Check each label for what it contains (complete, macro only, iron only) and whether it's labelled shrimp-safe.

Simple Dosing Schedules

Low-tech tank (no CO2, modest light)

• Liquid: a complete fertiliser at the label's low-tech dose, or half the full dose, once a week after the water change.
• Root tabs: one tab near each crypt, sword or vallisneria clump every 2–3 months.
• Light: 6–8 hours. More light without CO2 means more algae, not more plant growth.

Our aquascape plants without CO2 guide lists plants that thrive on this routine.

CO2-injected tank (strong light)

• Liquid: dose more often, typically 2–3 times a week or daily as the product says. Fast growth uses nutrients quickly.
• Root tabs: for root feeders, as above.
• Weekly water change of 30–50% resets any build-up.

See our cara pasang CO2 aquascape guide for the CO2 side.

Tips for every tank

• Start low and increase slowly over a few weeks.
• Dose at the same time each week.
• Don't increase fertiliser if algae is already spreading. Fix the light first.
• Write it down. A small note on the cabinet saves guesswork.

How to Insert Root Tabs

1. Push the tab deep into the substrate, about 5 cm, close to the plant roots (a few cm away, not touching).
2. Use tweezers or your finger, and cover the hole.
3. Space them every 10–15 cm under heavy root feeders.
4. Push them deep enough. Shallow tabs leak into the water and can trigger algae.

Reading Deficiency Signs on Leaves

What you see	Possible shortage	What to try
Older (lower) leaves turn yellow first	Nitrogen	Complete or macro fertiliser
Small pinholes, then yellow edges on older leaves	Potassium	Fertiliser containing potassium
New leaves pale or yellow with green veins	Iron or other micros	Iron or micro fertiliser; root tabs
New leaves twisted or stunted	Calcium or other micros (common in very soft water)	Check GH; a GH booster or remineraliser may help
Red plants turn green or brown	Low iron and/or too little light	Iron, more light (with care), CO2
Green spot algae plus slow growth	Low phosphate	A complete fertiliser with P

These are clues, not a diagnosis. Change one thing at a time and wait 2 weeks. New growth tells you if it worked; damaged leaves won't recover.

Soft water with very low GH is common in parts of Malaysia, and this can limit calcium and magnesium. A GH test tells you. Read more in KH and GH explained.

Shrimp Safety: The Copper Question

Shrimp are sensitive to copper. Most aquarium fertilisers contain only trace amounts as a plant micronutrient, and many keepers use them with shrimp at normal doses. To be safe:

• Choose fertilisers labelled shrimp-safe where possible.
• Never use garden or houseplant fertiliser in an aquarium. Doses and ingredients aren't designed for fish or shrimp.
• Start with half doses in shrimp tanks and watch for shrimp acting strangely.
• Do regular water changes so nothing builds up.
• Keep copper-based fish medicine well away from shrimp tanks.

Fertiliser and Algae: Getting the Balance

Many people blame fertiliser for algae and stop dosing completely. Plants then starve, algae thrives, and the tank gets worse. Algae usually comes from light out of balance with nutrients and CO2, not from fertiliser alone. Healthy, fast-growing plants are the best algae control. If algae appears:

1. Cut light hours first.
2. Keep dosing, at a reduced amount.
3. Remove algae manually and change water.

Our cara hilangkan lumut dalam akuarium guide goes into this.

FAQ

Baja pokok aquascape perlu letak berapa kali seminggu?

Untuk akuarium low tech tanpa CO2, biasanya sekali seminggu selepas tukar air sudah cukup, ikut dos rendah pada label. Akuarium yang guna CO2 dan lampu kuat perlu baja lebih kerap, contohnya 2–3 kali seminggu.

Boleh guna baja pokok biasa untuk akuarium?

Tidak digalakkan. Baja taman atau baja pokok bunga tidak dibuat untuk ikan dan udang, dan dos serta kandungannya boleh membahayakan. Guna baja khas untuk akuarium.

Do I need root tabs if I use aquasoil?

Not at first. Aquasoil contains nutrients, but they run down over time. Add root tabs later for heavy root feeders like crypts and swords.

Will fertiliser kill my fish?

Aquarium fertiliser used at the label dose is safe for fish. Problems come from big overdoses or using non-aquarium products.

Why do my plants still look bad after fertilising?

Check light (too little or too much), CO2, and whether you're feeding the right way (liquid for leaf feeders, root tabs for root feeders). Also test GH; very soft water can cause problems.

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Feed your scape properly: browse aquarium fertilisers, aquatic plants and aquarium soil from sellers across Malaysia on FishyHub.