Hello! New to tanks but rescued a 3” angelfish that was getting bullied in a large tank at work. My 20g tank is 17 days old (put her in 7 days ago), no nitrites or chemicals, 6.5 pH, 78F, 3 mollies, 2 plants, 20% water changes 2-3x.
There’s obvious fin rot so am on day 6 of metronidazole...