Setting up a decorative freshwater aquarium is a great way to create a unique interior decoration and at the same time a relaxing hobby. Below is a simple guide to help you get started - even if it's your first time.
Choose the right aquarium and location
A tank with a capacity of 60-100 liters is best to start with - it is more biologically stable than very small aquariums.
Put them in the place:
away from direct sun
on a stable cabinet
with access to electricity
Equipment you will need
Basic equipment includes:
filter (water purification)
heater with thermostat
LED lighting
substrate (gravel or plant substrate)
Well-selected equipment is the key to a healthy ecosystem.
How to prepare an aquarium before flooding?
- Wash the aquarium (without chemicals!)
- Rinse the substrate
- Set up decorations
- Install the equipment
DO NOT use detergents - they are deadly to fish
Arrangement and plants
First, pour in the substrate, add decorations (roots, stones), and then plant the plants.
Great for beginners are:
anubias
cryptocoryne
waterweed
Plants help maintain biological balance and improve the appearance of the tank.
Flooding and maturation of the aquarium
After pouring water, start the equipment and wait 2-4 weeks before adding fish.
This is the time when the filter bacteria stabilize, the bacterial flora is created and the aquarium acquires the ability to decompose ammonia.
If you skip this step:
- fish may get poisoned
- the water will become unstable/turbid
Fish selection
To start with, choose species that are easy to grow, e.g.:
Gupiki
Molinezje
kiryski
If you don't know what fish to choose, check out:
- https://spotmeup.pl/blog/zwierzeta-20/atlas-ryb-słodkowodnych-akwariowych-510
- Scalar: https://spotmeup.pl/blog/zwierzeta-20/skalar-pterophyllum-scalare-511
- Magnificent loach: https://spotmeup.pl/blog/zwierzeta-20/bocja-wspaniała-chromobotia-macracanthus-512
- https://spotmeup.pl/blog/zwierzeta-20/paletki-discus-symphysodon-514
This will help you avoid choosing the wrong fish
Introduce fish gradually so as not to disturb the biological balance.
How to choose fish for an aquarium?
Pay attention to:
- water temperature
- level of aggression
- fish size
- lifestyle (gregarious vs solitary)
Biggest mistake: mixing random genres
Daily aquarium care
Water change
- 20-30% every 1-2 weeks
Feeding
- small portions
- 1-2 times a day
less = better
Fish watching
Pay attention to:
- behavior
- appetite
- appearance
The most common mistakes when setting up an aquarium
1. Introducing fish too quickly
This is the most common mistake. Lack of nitrogen cycle leads to fish poisoning.
2. Too small an aquarium to start with
Small aquariums are more difficult to maintain than larger ones - water parameters change more quickly.
3. Overfishing
Too many fish = water quality problems and disease.
4. No regular water changes
Even the best filter cannot replace fresh water.
5. Bad selection of fish
Combining species with different requirements ends in stress and aggression.
6. Overfeeding
Food leftovers spoil water and cause disease.
7. Turn off the filter at night
This destroys the filter bacteria and destabilizes the aquarium.
How SpotMeUp can help you set up an aquarium 🐠
The platform enables:
📅 arranging visits to specialists and aquarium stores
🎟️ participation in workshops and hobby events
💬 contact with enthusiasts and experts
🛍️ access to offers and promotions on equipment and accessories
Thanks to this, you can gain knowledge faster, find proven suppliers and avoid typical beginner mistakes.
✅Summary
Setting up a freshwater aquarium is not difficult if you approach it step by step. With the right support and access to knowledge, you can create a beautiful, healthy tank that you will enjoy for years.
Checklist: start aquarium
✔ aquarium 60–100 liters
✔ filter
✔ heater
✔ substrate
✔ decorations
✔ lighting
✔ patience (the most important thing!)
Frequently asked questions (FAQ)
How to set up a freshwater aquarium step by step?
Setting up an aquarium starts with choosing a tank, filter and lighting. Then you add the substrate, decorations and water, start filtration and wait a few days for stabilization. You only add fish after the water parameters have stabilized.
How long do you have to wait before adding fish?
Most often 7–14 days. During this time, the aquarium undergoes a maturation process (nitrogen cycle), which is crucial for the health of the fish.
What fish are best for the first aquarium?
Peaceful and resistant species are best for beginners. It is worth starting with smaller fish and avoiding demanding species such as discus.
Does the filter have to run all the time?
Yes - the filter should run 24/7. Turning it off disturbs the biological balance and may harm the fish.
How often should you change the water in the aquarium?
It is recommended to change 20-30% of the water every 1-2 weeks, depending on the size of the aquarium and the number of fish.
How to choose fish for one aquarium?
Fish should have similar requirements regarding temperature, pH and behavior. Avoid mixing aggressive species with peaceful ones.
