How to Set Up Your First Planted Aquarium

A first planted tank does not need to be complicated or expensive. Most early failures come from doing too much too quickly: strong light, too many fish, and constant changes. The plan below keeps each decision simple and leaves room to upgrade later.

Step 1: What size tank should a beginner choose?

Very small tanks are tempting, but their water chemistry and temperature can shift quickly. Many hobbyists find that a tank somewhere in the middle range, large enough to buffer small mistakes but small enough to maintain easily, is the most forgiving place to start. A longer, shallower tank is also easier to light and to reach into than a tall one.

Water is heavy, at roughly one kilogram per litre, or a little over eight pounds per US gallon, before you add substrate, rock, and glass. Put the tank on a stand that its maker rates for the full filled weight, on a floor that can carry it, and check that the surface is level and flat. If you are considering a rimless tank, the rimless aquarium buying guide covers leveling mats and support in more detail.

Step 2: Decide on low-tech, and plan easy plants

For a first tank, a low-tech approach is usually the calmest route: moderate light, no injected CO2, and slow-growing plants. The trade-offs are covered in low-tech vs. high-tech planted tanks, but the short version is that low-tech tanks grow more slowly and are more forgiving of small mistakes.

Plants that suit this approach include:

• Anubias and Java fern, which grow from a rhizome. Tie or glue them to wood or rock, or wedge them between stones. Keep the rhizome above the substrate; if it is buried, it tends to rot.
• Cryptocorynes, rooted plants for the foreground and midground that appreciate root tabs in plain gravel or sand.
• Mosses, which attach to hardscape and soften edges.
• A few easy stem plants, such as Hygrophila, to grow quickly and absorb excess nutrients in the early weeks.

See easy aquarium plants for beginners for placement and planting notes on each.

Step 3: What equipment does a planted tank need?

You need four things for most tropical planted tanks:

1. A light that spans the tank's length and, ideally, can be dimmed and scheduled. The guide to choosing planted aquarium lighting explains how to match a fixture to your tank, and the lighting hub lists what to check.
2. A filter rated for at least your tank's volume, with gentle flow that reaches every corner. See the planted aquarium filter guide.
3. A heater, if the fish or shrimp you plan to keep need warmer water than your room provides. Many easy plants are fine without one.
4. A timer, unless the light has a reliable built-in schedule. Aquarium timers and lighting schedules explains why consistency matters.

Add a liquid test kit, a water conditioner that treats both chlorine and chloramine, a bucket used only for the aquarium, and a simple siphon. Long tweezers and scissors help once planting begins; see essential aquascaping tools.

Step 4: Add the substrate and hardscape

If you plan mostly epiphytes on wood and rock, plain gravel or sand is fine. If you want many rooted plants, a nutrient-rich aquasoil, or an inert substrate supplemented with root tabs, gives roots more to work with. Tropica's setup guidance describes a substrate sloping up toward the back, with at least 3 to 4 cm at the front and 6 to 8 cm at the back. The guide to choosing aquarium substrate covers types, depth, and how to estimate quantity.

Place wood and rock before planting. Step back often and look from the front at viewing height. Simple layouts with one main focal point and open swimming space tend to age better than busy ones.

Step 5: Plant, then fill gently

Some keepers plant into damp substrate before filling; others fill the tank partway first so plants are easier to position. Either way:

• Push rooted plants into the substrate with tweezers and leave the crown of crypts at the surface.
• Attach epiphytes to hardscape with cotton thread, fishing line, or an aquarium-safe gel glue.
• Plant densely from the start. More plant mass early on leaves less room for algae.

Fill slowly by pouring onto a plate or plastic bag so the substrate stays in place, adding conditioner to the tap water as you go.

Step 6: When can you add fish to a new planted tank?

A new tank has not yet grown the bacteria that convert fish waste. Cycle it first, using an ammonia source and testing regularly, until ammonia and nitrite both read zero and nitrate is present. The full process is in aquarium cycling and water testing, and the test kits hub covers what to look for in a kit.

Tropica's startup guidance gives concrete numbers for this period: light for 6 hours a day in the first 2 to 3 weeks, then 8 to 10 hours; change 25 to 50% of the water a couple of times a week for the first 3 to 4 weeks; and give no fertilizer, or only a little, during those first weeks. Tropica also recommends delaying fish for 3 to 4 weeks while the plants establish, and calls the first 90 days critical for balancing plant growth, fish, and filtration. That is a reasonable pattern to follow while the tank settles.

Step 7: Add animals gradually

Once the tank is cycled, add a small group of hardy, peaceful fish or shrimp suited to your water, then wait a week or two and test again before adding more. Adding everything at once can overwhelm a young bacterial colony. Choose animals that will not uproot or eat your plants, and check their temperature and hardness needs against your tap water.

Step 8: Settle into a simple routine

A sustainable weekly routine looks like this:

• Change around 25% of the water, the figure Tropica's care guidance suggests, and treat the new water.
• Remove dead or melting leaves promptly, since decaying plant matter feeds algae.
• Wipe the glass and check that the filter, heater, and light are working.
• Trim fast growers before they shade slower plants.
• Dose fertilizer lightly if plants are growing; planted tank fertilizer basics explains where to start.

Feed fish sparingly. Uneaten food is one of the most common sources of excess nutrients.

What happens in a planted tank's first month?

• Melting crypts. Cryptocorynes often lose leaves after planting as they adjust. Leave the roots in place; new leaves usually follow within a few weeks.
• Brown diatoms. A dusty brown film on glass, leaves, and hardscape is common in new tanks and typically fades as the tank matures. Wipe it off during water changes.
• Cloudy water. Mild cloudiness often clears on its own as the filter matures.
• Slow growth. Epiphytes and crypts may barely change for weeks while they root. That is normal in a low-tech tank.

If algae persists past the first month, the planted tank algae troubleshooting guide walks through likely causes.

Quick answers

What is the easiest way to start a planted tank? Go low-tech: moderate light, no injected CO2, and slow, forgiving plants such as Anubias, Java fern, cryptocorynes, and mosses, planted densely.

How long should the lights be on in a new planted tank? Tropica suggests about 6 hours a day for the first 2 to 3 weeks, then 8 to 10 hours.

When can I add fish? Only after cycling, when ammonia and nitrite both test at zero and nitrate is present. Then add a small group and wait a week or two before adding more.

Is melting and brown dust normal in a new tank? Yes. Cryptocorynes often melt after planting and brown diatoms are common early; both usually pass as the tank matures.

Common mistakes

• Too much light too soon. A strong light at full power without CO2 invites algae. Start dim and short, then increase slowly. See aquarium light intensity and duration.
• Burying rhizomes. Anubias and Java fern rot when their rhizome is covered.
• Skipping the cycle. Adding fish to an uncycled tank exposes them to ammonia and nitrite.
• Too few plants. Sparse planting leaves nutrients for algae.
• Constant rearranging. Moving plants repeatedly sets them back, especially crypts.
• Overfeeding. Extra food becomes extra nutrients.

Next steps

• Pick your plant list from easy aquarium plants for beginners.
• Decide on a substrate with how to choose aquarium substrate, then browse the substrates hub and our planted aquarium substrates by type.
• Read aquarium cycling and water testing before you fill the tank, and pick a kit from our water test kits for planted tanks.
• Not sure where to begin with equipment? Try the setup finder.