Aquarium Plant Fertilizer Guide for Thriving Planted Tanks

Keeping aquarium plants healthy isn’t just about good lighting — it’s about giving them the nutrients they need to grow strong, vibrant, and algae‑free. In this video guide, we break down the fundamentals of aquarium fertilization so you can build a lush, thriving planted tank with confidence.

Whether you're running a low‑tech nano or a high‑energy aquascape, understanding fertilizers is the key to consistent growth and long‑term plant health.

Why Fertilizers Matter for Planted Tanks

Aquarium plants rely on a balance of macro nutrients (NPK) and micro nutrients (iron, manganese, zinc, etc.). In closed systems like aquariums, these nutrients quickly run out — especially in tanks with fast‑growing stems or carpeting plants.

Without proper fertilization, you’ll see:

Yellowing leaves

Holes or melting

Slow or stunted growth

Algae taking advantage of nutrient imbalance

The right fertilizer routine keeps plants strong, resilient, and beautifully coloured.

Liquid Fertilizers vs Root Tabs

Liquid fertilizers feed water‑column feeders like stems, mosses, and floaters.
Root tabs feed heavy root feeders like swords, crypts, and bulbs.

Most tanks benefit from using both.

Fertilizers are one of the simplest ways to transform your planted tank from “okay” to “incredible.” With the right balance of macros, micros, and consistent dosing, your plants will reward you with lush growth and vibrant colour.