I have a 160 litre community tank. I normally have no trouble keeping my fish alive. I have an eclectic mix of angels, gourami, various tetra, golden barbs and harlequins. Each day now for the past week, I have an average of 2-3 fish die. Normally they are neons but I recently lost 5 conchu tetras, a couple of golden barbs and a harlequin. Nothing has changed about my tank recently except the addition of a brand new and more effective filter. I do regular water changes and my PH levels are pretty normal.
Any feedback/ideas/recommendations would be gratefully received!