Planted Aquarium Guide

A planted tank is the most rewarding kind of freshwater aquarium — and the one where small mistakes show up fastest as algae. The good news is that a healthy, good-looking planted tank does not require expensive gear. It requires the right balance of light, nutrients, and patience. This guide walks you through every decision, and links out to the in-depth pieces for each part.

Low-tech or high-tech? Choose your path first

Almost every planted-tank decision flows from this one choice:

• Low-tech (no CO2): easy plants, modest light, a liquid fertilizer. Slow but stable, forgiving, cheap. This is where everyone should start.
• High-tech (with CO2): carpets, red plants, fast growth — but it demands CO2 injection, stronger light, regular dosing, and more frequent trimming. More moving parts, more ways to grow algae.

If you are new, commit to low-tech first. You can always upgrade later.

Light: the engine of plant growth

Plants grow on light, so the fixture matters more than almost anything else. You want a full-spectrum LED (with red and blue diodes), intensity matched to your plants, and a timer for a consistent photoperiod. Our best planted-tank light guide breaks down what to look for and recommends picks by budget, and if you are choosing between the two most popular brands, see NICREW vs Hygger.

The single most common beginner mistake is running too much light for too long — that grows algae, not plants. Start at 6 to 8 hours a day.

Substrate: where plants root

You have two broad options:

• Inert substrate (gravel or sand): cheap and permanent, but provides no nutrients — you feed plants through the water column with liquid ferts and root tabs.
• Active/aqua soil: nutrient-rich and often buffers water soft and acidic; great for demanding plants, but it can leach ammonia early and eventually exhausts.

For low-tech, an inert substrate plus root tabs is perfectly fine.

CO2 and fertilizer

Plants need carbon and nutrients. In low-tech tanks, fish waste plus a liquid all-in-one fertilizer covers most needs. Add CO2 only when you commit to high-tech — and remember the rule: light, CO2, and nutrients must be balanced. Push one without the others and algae fills the gap.

Easy plants to start with

Build confidence with near-indestructible species before anything demanding:

• Anubias and Java fern — tie to hardscape, low light, slow and tough.
• Mosses (Java moss) — carpet hardscape, give shrimp a home.
• Crypts and Amazon swords — rooted plants for the mid and background.

Livestock for a planted tank

Plants and the right livestock reinforce each other. Great choices:

• Shrimp — cherry shrimp for color, Amano shrimp as the hardest-working algae eaters in the hobby.
• Snails — nerite snails graze algae without overpopulating.
• Nano fish — chili rasboras look stunning in a soft, planted blackwater tank.

Keeping algae in check

Some algae is normal; an outbreak means something is out of balance. The fix is rarely "scrub harder" — it is balancing light against CO2 and nutrients, and running a cleanup crew. See our full aquarium algae control guide for causes and fixes by algae type.

A simple maintenance routine

• Weekly: a 25–50% water change, dose fertilizer, wipe the glass.
• As needed: trim fast growers, top off evaporation, clean the filter in tank water.
• Always: keep the photoperiod consistent (a timer does this for you).

Start low-tech, get the balance right, and let the tank mature. A patient planted tank rewards you with lush growth and almost no algae — the opposite of the rushed, over-lit tanks that frustrate most beginners.