Hi Jade.T107
Can you start a new thread for your fish issue?
This one is from 2004 and it is easier if you start your own thread so we can deal with your issue alone.
Post pictures of the fish so we can clearly see the fish and damaged fins?
How long has the tank been set up for?
How often do you do water changes and how much water do you change?
Do you dechlorinate the tap water before adding it to the tank?
Do you gravel clean the substrate when you do a water change?
Do you have buckets specifically for the fish or do you use any bucket around the house?
Check the water quality for ammonia, nitrite, nitrate, pH and general hardness (GH). Post the results in numbers.
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What did you use to treat the Fin Rot?
Fin Rot is caused by poor water quality that damages the fins and allows bacteria to get into the damaged tissue and make the fish sick.
Doing a 75% water change and gravel cleaning the substrate each day for a week normally fixes the problem without the need for chemicals/ medications.
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.