Beginner path · 7 steps
Start Here: Your First Planted Aquarium
Starting a planted aquarium involves more decisions than a fish-only tank, from substrate and lighting to CO2 and plant choice. This path walks through the setup in order, from choosing equipment through building a maintenance routine that keeps the tank stable long term.
Step 1: Choose a tank size and core equipment
Start by picking a tank size that fits the space available and the level of commitment you want to take on, since larger tanks are often more forgiving on water stability than very small ones despite seeming more intimidating. Alongside the tank itself, plan for a filter sized to the tank's volume, a heater if the room runs cool, and a light strong enough to support live plants rather than a basic fish-only fixture. Buying equipment as a matched set, or checking a kit's specifications carefully, avoids the common problem of ending up with a light or filter that undersells the tank once it is stocked with plants.
Step 2: Pick a substrate and hardscape
Decide between a nutrient-rich aqua soil and an inert substrate like sand or gravel paired with root tabs, since this choice affects both plant growth and how much fertilizing the tank needs early on. Layer in hardscape, such as rock or driftwood, before adding water, since dry placement is far easier to adjust than moving heavy pieces around plants and substrate later. Soak or boil driftwood first to remove tannins and help it sink, and dry-fit stones and wood together until the arrangement looks balanced rather than scattered.
Step 3: Cycle the tank before adding any fish
Run the tank empty of fish for several weeks while the nitrogen cycle establishes itself, either by dosing ammonia directly or by stocking very lightly and testing water daily as the bacteria colony builds up. Use a liquid test kit rather than guessing from how the water looks, since ammonia and nitrite are invisible and a clear tank can still be dangerous for fish. Only add fish once ammonia and nitrite both read zero consistently, since skipping this step is one of the most common reasons new tanks lose fish in the first few weeks.
Step 4: Plant with beginner-friendly species
Choose plants known to tolerate a range of light and CO2 levels while the tank is still finding its balance, rather than starting with the most demanding carpeting or stem species available. Expect some melt on new plants in the first couple of weeks as older leaves die back and new, submerged growth takes over, which is normal rather than a sign of failure. Plant in small groups spaced with room to fill in, since crowding everything in at once makes it harder to see growth and adjust the layout as plants establish.
Step 5: Dial in lighting and decide on CO2
Set a consistent photoperiod, typically around six to eight hours a day, and keep it on a timer so lighting stays predictable rather than drifting from day to day. Decide early whether the tank will run low-tech, without added CO2, or high-tech, with CO2 injection, since this choice affects which plants will thrive and how much fertilizing the tank will need. A low-tech tank with modest light and easy plants is usually the more forgiving starting point, with CO2 added later once the basics of plant care feel comfortable.
Step 6: Add fish or shrimp gradually and quarantine new arrivals
Once the tank has cycled, add fish or shrimp in small batches rather than all at once, giving the bacteria colony time to catch up with each new addition's waste output. Where possible, hold new arrivals in a separate quarantine tank for a couple of weeks first, watching for signs of illness before they join the main display. Shrimp in particular are sensitive to sudden water changes and copper in some medications and fertilizers, so research compatibility with the tank's plant care routine before adding them.
Step 7: Build a weekly maintenance routine
Settle into a regular rhythm of partial water changes, typically weekly, paired with a gravel vacuum pass through the substrate to remove debris before it breaks down into extra nutrients. Trim stem and carpeting plants as they grow to keep light reaching lower leaves and to stop the layout from looking overgrown, replanting healthy cuttings where there is room. Keep an eye out for early signs of algae, since catching an outbreak early and adjusting light, CO2 or fertilizer dosing is far easier than fighting an established problem later on.
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