Previous Questions

    Latest Questions: Fish Care

  • Why do I have to remove the carbon filter when using treatments or medicines?
    The carbon in the filter removes contaminants and chemicals from the water. Therefore, if you leave it in whilst treating your tank for something, it will remove the treatment and whatever you were trying to treat will continue to be a problem.
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  • Can I use more than one treatment or medicine at a time?
    For most treatments, the answer is definitely no. You should never use more than one fish medicine at a time, because they might react with one another in the water.  The exceptions are King British Filter Aid + (formerly Safe Water), King British Safe Home and King British De-Chlorinator (formerly Safe Guard) water treatments. These can be used with any other treatments, including each other.
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  • Several of my fish have died. What's killed them?
    There are many reasons why some of your fish have died. You need to review everything that may have occurred in your aquarium in the last 3 weeks or so.  There are some basic questions that you can ask yourself that will help you to understand what has happened.  1. Check the water quality – are there any unusual results? Are the ammonia and nitrite at a safe level?  2. Check the dead fish and your remaining fish for any signs of infection or disease. Are there any unusual marks, …
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  • How long do fish take to recover from Fin Rot?
    This depends on how bad the problem is to start with. By using King British Fin Rot & Fungus Control there should be an improvement in 4-5 days. Due to fish having open wounds it is very important to keep water quality pristine, to prevent secondary infection taking place.
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  • I think my fish has a problem with its swimbladder
    The swim bladder is a small organ inside the fish that can fill up with air or deflate, allowing the fish to move around in the water column more easily. The swim bladder is quite prone to infection, which can cause bloating, disorientated swimming, and involuntary floating or sinking. Alternatively, the gut of fish may have trapped air, caused by constipation or by an infection.  ✔  You should stop feeding for a day or two, and check the water quality using King British 6 in 1 Water Test Strips.&n…
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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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