Previous Questions

    Latest Questions: Behaviour

  • My goldfish is gasping at the water surface. What should I do?
    The first thing to do is to test the water – especially for ammonia and nitrite. High ammonia and nitrite cause fish to suffer respiratory problems, and they will gasp at the water surface to try to get some oxygen. Low dissolved oxygen could also be a problem. You need to increase the aeration and carry out a partial water change. It is important to find out the cause of the incident to prevent it from happening again. Check that the filter is working correctly, and that the tank is not dirty. M…
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  • One of my fish is bullying its mates. What should I do?
    Add plants or ornaments If you have no plants or ornaments in your aquarium, then it is a good idea to add some. These will offer shelter and hiding places for the fish that are being bullied. It also helps to separate areas of the tank.  Check that your fish are compatible You should also check that the fish in your aquarium are actually compatible. If only one fish is being bullied then it could become a problem, because it will become very distressed and vulnerable to disease. However, …
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Most Frequently Asked

How often should I change my aquarium water?

Most aquariums should be cleaned every 2 weeks on average. It is easier to combine cleaning and water changes by using a gravel siphon, as this also removes any dirt and waste from the bottom of the tank.


When can I add new fish to my tank?

If you are introducing new fish to a matured aquarium, then there shouldn’t be a problem. However, you should monitor the ammonia and nitrite level for the few days following introduction as a precaution. Also, you should quarantine any new fish for at least 4 days in a separate tank before adding to your main tank. This will help to prevent spreading any diseases.

It is advisable to run a new tank with water only for at least 1 to 2 weeks before adding fish, to allow the filter to build up some beneficial bacteria. It helps to add King British Filter Aid + during this period to help the filter to mature. Fish produce ammonia through respiration, and release it into the water through their urine and across the gills. In a matured aquarium, the filter can remove the ammonia quickly before it causes any problems. However, in a new, un-matured aquarium the ammonia will linger and may build up and cause problems. If fish are added straight away to a new tank, then the ammonia they produce can poison them and they may die. Also, once you do start adding fish, they should be added slowly and gradually, not all at once. Spread it out over of a period of weeks by adding two or three fish at a time, to allow the filter to adjust to the larger load of ammonia and nitrite.

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