Hi all so after losing a few fish this week in qt. After some help and advice. Qt left going is at day 15 of copper power being at 2.50ppm cu. I was using black drain guttering from b & q. Looked ok on the product info but have removed this incase it was leaching something harmful. Have just a foxface and 2 clowns left now. Not seen any flashing, no flashing on the fish that died either. The 2 ammonia badges have stayed yellow. But thats not to say i had a spike somewhere. Have been doing my wc regardless of badges showing yellow still. What am i doing wrong?? Is there any pvc tubing that is 100% qt safe in the uk you can recommend? Meds i have are copper power, metroplex, prazipro, general cure, myaxzin. Any help welcome. Ive attached 2 pics of the fish left. Note food on bottom has just gone in



