HELP PLEASE ASAP! Injured Fin on molly. Fun won’t move and sinking to the bottom!

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Queensimpson

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I did a water change earlier today and I think the sand moving might’ve injured my Molly. His fin is torn up and he was sinking to the bottom 2 hours afterwards. I thought he was dead but I scooped him up and he moved a little. I put him in a fry container (the plastic piece that goes in the tank to seperate a fish) for now because I don’t want him injuring himself anymore.

I don’t know what to do at all. I am so sad for him and want to help!

About aquarium;
36 gallon tank
Cycled using seeded filters for 2 months before introduction of fish
Very very little ammonia (doses prime)
0 nitrites
10 nitrates.
I dechlorinate water using seachem prime everytime and make sure temp is the same.
I have 3 ballon mollies, 1 regular Molly. 6 guppies.
 
Oh by the way the left fin is moving and fine, it’s the right fin that isn’t moving at all :(
 
Do a big water change and gravel clean the substrate every day for a week. And add some salt.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

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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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