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Old 01-20-2023, 08:28 AM   #1
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New Molly

Hi, I brought home 3 new Mollies from my LFS yesterday. I stupidly didnít quarantine as I have not had problems from this store before and it has a great reputation locally. However, as soon as I released them into the tank I noticed a white patch protruding above the black femaleís eye. Iím a worrier and not sure if Iím panicking over nothing or should I take it back to the shop as I think it could be a fungus? Iíve attached a photo.
As the fish is brand new I donít know itís usual behaviour, but it seems to be eating/swimming fine, not hiding/scratching/shimmying and as you can see the poop and fins looks normal.
Tank has been up and running since November, 200 litres, PH 7.2, ammonia 0, nitrites 0, nitrates currently 10, I do a change at 15 -20. This tank is usually really stable and Iím gutted I may have introduced something into it through being too eager to get a new fish in!
Any thoughts on what this is and how to treat if necessary please?
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Old 01-20-2023, 12:24 PM   #2
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Excess mucous caused by something irritating the fish or a physical injury that the fish has put more mucous on to help protect the injured area.

Wipe the inside of the glass down with a clean fish sponge. This removes the biofilm on the glass and the biofilm will contain lots of harmful bacteria, fungus, protozoans and various other microscopic life forms.

Do a 75% water change and gravel clean the substrate. The water change and gravel cleaning will reduce the number of disease organisms in the water and provide a cleaner environment for the fish to recover in. It also removes a lot of the gunk and this means any medication can work on treating the fish instead of being wasted killing the pathogens in the gunk.
Make sure any new water is free of chlorine/ chloramine before it is added to the tank.

Clean the filter if it hasn't been done in the last 2 weeks. However, if the filter is less than 6 weeks old, do not clean it. Wash the filter materials/ media in a bucket of tank water and re-use the media. Tip the bucket of dirty water on the garden/ lawn. Cleaning the filter means less gunk and cleaner water with fewer pathogens so any medication (if needed) will work more effectively on the fish.

Increase surface turbulence/ aeration to maximise the dissolved oxygen in the water.

Add some salt, (see directions below).

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SALT
You can add rock salt (often sold as aquarium salt), swimming pool salt, or any non iodised salt (sodium chloride) to the aquarium at the dose rate of 1 heaped tablespoon per 20 litres of water. If there is no improvement after 48 hours you can double that dose rate so there is 2 heaped tablespoons of salt 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, Bettas & 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, fish, plants, shrimp or snails.

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.

When you first add salt, add the salt to a small bucket of tank water and dissolve the salt. Then slowly pour the salt water into the tank near the filter outlet. Add the salt over a couple of minutes.
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Old 01-20-2023, 02:14 PM   #3
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Thanks Colin. I did go back to the LFS a couple of hour ago with a photo and came away with some salt so Iíve been cleaning up and will get some salt in there now.
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