Help? Kuhli loach with white marks?

Jdarrowsmith1991

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Hey I'm relatively new and I've noticed this on one of my loaches? Can anyone assist? Tia
 

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It kind of looks like his scales rubbed away leaving just his skin. Kuhli loaches don’t have very good scales on them and they have none on their head, so they are very fragile fish. I see that in the picture you have gravel and you should probably switch to a finer substrate such as sand so they can dig and not get so scratched up. Other than that does he look healthy? Is he swimming, what other fish do you have in there, what is the size of the tank, does he look like he’s getting picked on my the other fish?
 
Physical injury, the skin has been scraped off and the white stuff is muscle tissue. Other fish might have bitten it too so monitor the fish for aggression.

Look for sharp or rough objects in the tank and remove them. Check the gravel too. Rub some across the palm of your hand and if it feels rough or sharp and scratches, then you need to change it to something smoother and less abrasive.

Do the following to reduce infection. If it goes red or develops white fluffy stuff on it, post pictures asap and add some salt or medications. Red is normally bacterial, white fluffy is fungus. Salt treats both but you can also get liquid medications that treat both.

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Test the water for ammonia, nitrite, nitrate and pH.

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 every day for a week. The water changes 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.

Maybe add some salt in a couple of days if it looks red.

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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 1-2 weeks.

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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