I have a small tank with a three inch male blue phantom pleco two corys and tetras 4-5 hours ago I added some acurel ammonia reduceing pad to the filter wich also has cut eheim carbon pads and sponge and white tube media and fed fish maybe 3 hours ago and now most of my fish being a hatchetfish and all the bottom dwellers are breathing really heavy the plec is breathing hard with mouth open and fans self with fins every two minuts wat could prob be I added neutral regulator and stress zyme in hopes it will combat the prob whatever it is many tetras are all fine but don't want to lose the blue plec