So now the tank holds tha Salvini pair, a herotilapia multispinosa pair and 6 mollies, everything was okay until I decided to medicate the tank yesterday. The reason was I had some paracite issues in my other tank and have been using the same nets and stuff back and forth plus the mollies were showing some clamped fins and stuff and I figured some antibactierial wouldn't hurt considering the salvini female's wounds. So I put in the normal dose of paraclense, marycin and Ich-X and this morning the tank was cloudy and most of the fish gasping for air at the top, then very shortly tha male salvini starts showing some extreme dying behaviour (sinking to the bottom, smashing into the substrate and decor, floating upside down, etc...). So I did a 80% waterchange but meanwhile the salvini male died. Has anyone had a similar experience with those meds? I think they might have maybe killed a lot of beneficial bacteria and/or depleted the water of oxygen.