Molly fish shaking head from side to side
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Hi and welcome to the forum 
How long has the tank been set up for?
How often are you feeding the fish?
How often do you do water changes and how much water do you change?
Do you gravel clean the substrate when you do a water change?
Have you checked the GH (general hardness) and pH of the water?
Mollies come from water with a GH above 250ppm and a pH above 7.0. If they are in soft water (GH less than 150ppm) they will have problems.
You can usually find the GH and pH on your water supply company's website or by telephoning them. If they can't help, take a glass full of tap water to your local pet shop and ask them to test it for you. Write the results down in numbers when they do the test. And ask them what the results are in (eg: ppm or dGH).
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Right now I would suggest doing a 75% water change and gravel clean the substrate every day for the next week or so, until we find out what is going on. Make sure any new water is free of chlorine/ chloramine before it is added to the tank.
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The following link has some info on what to do if your fish gets sick. It is pretty long and boring but worth knowing. I recommend printing it out and reading it in bed to help fall asleep.
http://www.fishforums.net/threads/what-to-do-if-your-fish-gets-sick.450268/#post-3804819
How long has the tank been set up for?
How often are you feeding the fish?
How often do you do water changes and how much water do you change?
Do you gravel clean the substrate when you do a water change?
Have you checked the GH (general hardness) and pH of the water?
Mollies come from water with a GH above 250ppm and a pH above 7.0. If they are in soft water (GH less than 150ppm) they will have problems.
You can usually find the GH and pH on your water supply company's website or by telephoning them. If they can't help, take a glass full of tap water to your local pet shop and ask them to test it for you. Write the results down in numbers when they do the test. And ask them what the results are in (eg: ppm or dGH).
------------------------
Right now I would suggest doing a 75% water change and gravel clean the substrate every day for the next week or so, until we find out what is going on. Make sure any new water is free of chlorine/ chloramine before it is added to the tank.
------------------------
The following link has some info on what to do if your fish gets sick. It is pretty long and boring but worth knowing. I recommend printing it out and reading it in bed to help fall asleep.
http://www.fishforums.net/threads/what-to-do-if-your-fish-gets-sick.450268/#post-3804819
OP
OP
TO KYO
Fish Fanatic
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- Feb 25, 2019
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Tank been set for 2 days all other mollies are doing fine except for this one who won’t stop swimming and shaking wish started doing it like 4 hours agoHi and welcome to the forum
How long has the tank been set up for?
How often are you feeding the fish?
How often do you do water changes and how much water do you change?
Do you gravel clean the substrate when you do a water change?
Have you checked the GH (general hardness) and pH of the water?
Mollies come from water with a GH above 250ppm and a pH above 7.0. If they are in soft water (GH less than 150ppm) they will have problems.
You can usually find the GH and pH on your water supply company's website or by telephoning them. If they can't help, take a glass full of tap water to your local pet shop and ask them to test it for you. Write the results down in numbers when they do the test. And ask them what the results are in (eg: ppm or dGH).
------------------------
Right now I would suggest doing a 75% water change and gravel clean the substrate every day for the next week or so, until we find out what is going on. Make sure any new water is free of chlorine/ chloramine before it is added to the tank.
------------------------
The following link has some info on what to do if your fish gets sick. It is pretty long and boring but worth knowing. I recommend printing it out and reading it in bed to help fall asleep.
http://www.fishforums.net/threads/what-to-do-if-your-fish-gets-sick.450268/#post-3804819
Reduce feeding to a couple of times a week.
Do a 75% water change and gravel clean the substrate any day you have an ammonia or nitrite reading above 0.
Post a clear picture and short 20 second video of the sick fish if you can. We can check it for diseases.
---------------------
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, 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. Then do a 20% water change each day for a week. Then you can do bigger water changes after that.
Do a 75% water change and gravel clean the substrate any day you have an ammonia or nitrite reading above 0.
Post a clear picture and short 20 second video of the sick fish if you can. We can check it for diseases.
---------------------
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, 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. Then do a 20% water change each day for a week. Then you can do bigger water changes after that.
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