The water has become cloudy: is the aquarium faulty?
No. This is a normal phenomenon in the first few days of use.
This is a so-called “bacterial bloom”, which occurs as the filter develops beneficial bacteria for water purification.
Keep the filter running and perform small water changes (10–20%).
The water will become clear again within a few days.
Can I add fish immediately?
No.
A new aquarium needs to mature for at least 2–4 weeks before housing fish. However, each aquarium has its own timeline, so to be safe, always ask your trusted pet store.
During this period, the filter establishes the necessary biological balance.
Adding fish too early can lead to dirty water and stress or loss of the animals.
Why do I have to wait before adding fish?
Because the aquarium is a living ecosystem.
Initially, the bacteria that convert harmful substances (like ammonia and nitrites) into less dangerous elements do NOT yet exist.
Without this maturation, the water quickly becomes toxic.
Can I turn off the filter at night?
No.
The filter must remain on 24 hours a day.
Turning it off will kill beneficial bacteria and upset the aquarium's balance.
How often should I change the water?
- During startup: 10–20% every 4–5 days
- Once established: 20–25% once a week
Never change all the water at once.
Is a water conditioner necessary?
Yes, always.
Tap water contains chlorine and heavy metals that are harmful to fish and bacteria.
Water conditioner makes the water safe in just a few minutes.
How do I clean the filter?
Only with aquarium water, never under the tap.
Tap water kills beneficial bacteria.
A light cleaning every 2–4 weeks is sufficient.
Do I need to use a heater?
It depends on the fish.
Most tropical fish require 24–26°C.
If the room is colder, a heater is essential.
The fish seem hungry: can I give them more food?
Better too little than too much.
Excess food quickly pollutes the water.
Rule of thumb: all food should be eaten within 1–2 minutes.
How many fish can I add?
It's best to start with a few specimens.
Add them gradually, a few days apart, to avoid overloading the filter.
The glass has condensation or bubbles: is this normal?
Yes, it's normal in the first few hours/days.
This is due to the temperature difference and the initial settling of the water.
I still have questions: what can I do?
Contact our AQPet customer service or consult the complete guide on our website.
We are happy to help you make your aquarium a success.