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Red patches right where fins meet the body. Pls help

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My goldfish seems to have fin rot so I did a 50% water change. Yesterday I noticed that he has beefy looking red patches right where is front fins meet his body. Also yesterday he seemed to have black patches on his body as well and today they look red. I’m not sure what this is or how to treat. I will be attaching pictures. The pictures make the patches not look red but they are. 




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Please copy & paste the following form and fill it out to the best of your ability when requesting help for Goldfish Problems:


Test Results for the Following:

 Ammonia Level(Tank)

 Nitrite Level(Tank)

 Nitrate level(Tank)

 Ammonia Level(Tap)

 Nitrite Level(Tap)

 Nitrate level(Tap)

 Ph Level, Tank (If possible, KH, GH and chloramines)

 Ph Level, Tap (If possible, KH, GH and chloramines)

Other Required Info:

 Brand of test-kit used and whether strips or drops?

 Water temperature?

 Tank size (how many gals.) and how long has it been running?

 What is the name and "size of the filter"(s)?

 How often do you change the water and how much?

 How many days ago was the last water change and how much did you change?

 How many fish in the tank and their size?

 What kind of water additives or conditioners?

 What do you feed your fish and how often?

 Any new fish added to the tank?

 Any medications added to the tank?

 List entire medication/treatment history for fish and tank.Please include salt, Prazi, PP, etc and the approximate time and duration of treatment.

 Any unusual findings on the fish such as "grains of salt," bloody streaks, frayed fins or fungus?

 Any unusual behavior like staying at the bottom, not eating, etc.?

"If copy and paste doesn't work for you, quote this post and put your answers after each question."

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Hi there! If you don’t have one already, please get a good test kit so we can figure out what is going on with your water.  API’s freshwater master test kit is inexpensive and lasts several years, I highly recommend it.  

Once you can test your water (before a water change, not right after) we should have a better idea of what is going on. Please fill out the form Koko linked to the very best of your ability.  More detail helps us treat much mire efficiently and with less surprises and time wasted :)

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Sorry for the late reply guys. He seems to be doing fine and everything seemed to clear up. I appreciate your replies!!

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