i have a 10 gallon tank with 3golden wonder killifish, 5 bumblebee gobies, and 6 dwarf puffers, 3of the dwarf puffers i got today and they are very thin, im using api general cure and when i read the directions, it said add in one packet per 10 gallons, wait 48 hours then add in more, but does it mean add in more without removing the rest so id have 2 packets in? Thanks