Fin Rot?
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Yes it looks like fin rot. This is normally caused by poor water quality damaging the mucous on the fish and allowing bacteria in that start eating the tail and fins.
Do a 75% water change and gravel clean the substrate every day for a couple of weeks. Make sure any new water is free of chlorine/ chloramine before it's added to the tank.
Clean the filter if it hasn't been done in the last 2 weeks. wash filter media/ materials in a bucket of tank water and re-use them. However, do not clean the filter if it less than 6 weeks old because you can interfere with the filter cycling process.
If there is no improvement after a couple of big water changes, or if it gets significantly worse during the next 24 hours, post more pictures and we can advise on medications to try.
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Do not use Melafix, Pimafix or Bettafix on Labyrinth fishes (Bettas & Gouramis), because they can leave an oily film on the surface that can prevent the fish being able to breath.
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You can add some salt to the tank and it can help with miner bacterial and fungal infections.
You can add rock salt (often sold as aquarium salt), sea salt or swimming pool salt to the aquarium at the dose rate of 2 heaped tablespoon per 20 litres of water.
If you only have livebearers (guppies, platies, swordtails, mollies), goldfish or rainbowfish in the tank you can double that dose rate, so you would add 4 heaped tablespoons per 20 litres.
Keep the salt level like this for at least 2 weeks but no longer than 4 weeks otherwise kidney damage can occur. Kidney damage is more likely to occur in fish from soft water (tetras, Corydoras, angelfish, gouramis, loaches) that are exposed to high levels of salt for an extended period of time, and is not an issue with livebearers, rainbowfish or other salt tolerant species.
The salt will not affect the beneficial filter bacteria but the higher dose rate will affect some plants. The lower dose rate will not affect plants.
After you use salt and the fish have recovered, you do a 10% water change each day for a week using only fresh water that has been dechlorinated. Then do a 20% water change each day for a week. Then you can do bigger water changes after that. This dilutes the salt out of the tank slowly so it doesn't harm the fish.
If you do water changes while using salt, you need to treat the new water with salt before adding it to the tank. This will keep the salt level stable in the tank and minimise stress on the fish.
Do a 75% water change and gravel clean the substrate every day for a couple of weeks. Make sure any new water is free of chlorine/ chloramine before it's added to the tank.
Clean the filter if it hasn't been done in the last 2 weeks. wash filter media/ materials in a bucket of tank water and re-use them. However, do not clean the filter if it less than 6 weeks old because you can interfere with the filter cycling process.
If there is no improvement after a couple of big water changes, or if it gets significantly worse during the next 24 hours, post more pictures and we can advise on medications to try.
--------------------------
Do not use Melafix, Pimafix or Bettafix on Labyrinth fishes (Bettas & Gouramis), because they can leave an oily film on the surface that can prevent the fish being able to breath.
--------------------------
You can add some salt to the tank and it can help with miner bacterial and fungal infections.
You can add rock salt (often sold as aquarium salt), sea salt or swimming pool salt to the aquarium at the dose rate of 2 heaped tablespoon per 20 litres of water.
If you only have livebearers (guppies, platies, swordtails, mollies), goldfish or rainbowfish in the tank you can double that dose rate, so you would add 4 heaped tablespoons per 20 litres.
Keep the salt level like this for at least 2 weeks but no longer than 4 weeks otherwise kidney damage can occur. Kidney damage is more likely to occur in fish from soft water (tetras, Corydoras, angelfish, gouramis, loaches) that are exposed to high levels of salt for an extended period of time, and is not an issue with livebearers, rainbowfish or other salt tolerant species.
The salt will not affect the beneficial filter bacteria but the higher dose rate will affect some plants. The lower dose rate will not affect plants.
After you use salt and the fish have recovered, you do a 10% water change each day for a week using only fresh water that has been dechlorinated. Then do a 20% water change each day for a week. Then you can do bigger water changes after that. This dilutes the salt out of the tank slowly so it doesn't harm the fish.
If you do water changes while using salt, you need to treat the new water with salt before adding it to the tank. This will keep the salt level stable in the tank and minimise stress on the fish.
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