I just lost 3 pencil fish to melafix, being unaware of the reports of issues. The rest are gasping and losing colour. API deny there is an issue, but my fish were healthy and died within 30 minutes. They are irresponsible and should be ashamed. Share the information. As melafix is basically tea tree oil I need advice how to remove it – I have done a 90% water change, but the oil is mostly on the surface. Should I skim off? Will any tank additive help? I hope the rest of my fish survive. I don't know if their gills will be permanently damaged.