Help with my guppy

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Pictures of the sick fish?

Add salt to the main tank. It should buy you some time until we figure out what is causing it. Do a huge water change and gravel clean the substrate too. And clean the filter.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

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If you already have am established tank with a cycled filter, take half the media and put it in the new filter on the new tank. Instant cycled tank and no need to wait 6 weeks to add fish. Just monitor ammonia and nitrite levels for a few weeks to make sure the filter is settled in. Reduce feeding for the first 2 weeks.
 
Pictures of the sick fish?

Add salt to the main tank. It should buy you some time until we figure out what is causing it. Do a huge water change and gravel clean the substrate too. And clean the filter.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

--------------------
If you already have am established tank with a cycled filter, take half the media and put it in the new filter on the new tank. Instant cycled tank and no need to wait 6 weeks to add fish. Just monitor ammonia and nitrite levels for a few weeks to make sure the filter is settled in. Reduce feeding for the first 2 weeks.
I'm just worried about taking media from the main tank because it is where the fish are getting sick
 
It's not very noticeable bit there is a whitish tinge around the fins and scales from her butt up her side
 

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It looks like excess mucous from a possible bacterial or protozoan infection.

Add salt.

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SALT
You can add rock salt (often sold as aquarium salt), sea salt or swimming pool salt 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.

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 2 heaped tablespoons per 20 litres and if there is no improvement after 48 hours, then increase it so there is a total of 4 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 but the higher dose rate (4 heaped tablespoons per 20 litres) will affect some plants and some snails. The lower dose rate (1-2 heaped tablespoons per 20 litres) will not affect 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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