Hi guys I’m in an emergency please help. I need to know which medicine to give my sick Tetra if they can’t swim well and continually gasp for air (not on the surface) don’t tell me that clean water is the best medicine because I’ve changed the water 3 times this week and they’re not getting better. I need a a quarantine tank and a medicine but my dad is refusing to buy anything if I don’t know which medicine to give her. The filter is working perfectly and all the tank mates are thriving. This is a matter of answering quickly or not, I’ve lost 2 fish this way please help!