What is this on my goldfish?

[YesseGriffen 1]

Recently I got a fish from a friend who neglected his fish, he kept the goldfish in very cloudy water and in a 4 gallon aquarium for a couple of years and didn't really care about him. The fish has had blood lines on his fins and such since I got him, will these heal up? He is a fancy goldfish, I think a fantail goldfish to be exact. 

https://mail.google.com/mail/u/0/?ui=2&ik=a72265e11a&view=att&th=15daf6ac6c3f011c&attid=0.1&disp=safe&realattid=1574842234196459520-local0&zw

https://mail.google.com/mail/u/0/?ui=2&ik=a72265e11a&view=att&th=15daf6b584fb847b&attid=0.1&disp=safe&realattid=1574842274050736128-local0&zw

[jenag145 0]

Do you have a pic? I can't see anything


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[YesseGriffen 1]

[FishyMandy 6,277]

Hi, welcome to kokos. I realize you only just got this fish, but if you fill out this form it could help us a lot, so we know what you have to work with. I suspect it's a lot to do with poor water quality, but there may be more going on as well.
 

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.?