so I recently reieved a leopard pleco on the 20 of January, his precious owner took terrible care of it , water was terrible, she gave me the whole set up with heater everything , I scrubbed the tank and equipment for 2 hours , and gave him a new home , however it turned out the heater wasn’t working so I couldn’t get a hold of another heater untill 24 of January , so I kept the tank warm with daily warm water changes and a hot water bottle by the tank, I got a a tank heater on the 24 and plugged it in straight away however throughout the days I discovered that the pleco was losing colour in patches on his body, I tried to let him recover as I thought it was just he needed more heat, however now I feel like he might have fin rot due to cold water and the stress, but I don’t want to treat the tank as I’m scared I will do it wrong or that he might have something else , I did do a 100% water change as i saw it to be recommended to do if a fish has fin rot, he still has his appetite, during water change i fed him a cucumber and I put some algae wafer in the tank as I did such a big water change. I want to buy some guppies to go in the tank however I don’t want to do it unless I’m 100% sure he’s healthy. Please help me diagnose my pleco.

