Hmmm, a wound for this long shouldn't keep bleeding like that. Wounds generaly stop bleeindg within the day. This might be contiually caused by an internal parasite. You could treat the tank with API General Cure or just Hikari PraziPro. If those do not help in a week, the next thing would be treating for round worms with levamisole.
You might also want to consider treating for a secondary bacterial infection afterwards with kanaplex.