i'd do antibiotics on that
kanaplex, metroplex, and furan 2 is the "trifecta" that's generally recommended for bacterial issues. i recently used it during ttm to fix a bacterial issue that was killing my fish. everyone i put through it lived and is still good to go a month later
Day 1- all three
Day 2- furan-2
Day 3- 25% waterchange THEN all 3
Day 4- furan-2
Day 5- 25% waterchange THEN all 3
Day 6- furan-2
Day 7- 25% waterchange THEN all 3
Day 8- furan-2
Day 9- 25% waterchange THEN all 3
Day 10- furan-2
Day 11- 25% (or more) waterchange
If you need to go 14 days-
Day 11- 25% waterchange THEN all 3
Day 12- furan-2
Day 13- 25% waterchange THEN all 3
Day 14- furan-2
Day 15- 25% (or more) waterchange
that's the schedule if you want