Ok so here goes. i've posted a thread saying my new fish were dying. Now my tenured inhabitants are suffering the same style death. IT begings with Heavy Breathing Stayin around the top. The slowly dipping towards the middle of the tank then finally laying on the bottom before dyings. THe fish have no fungus no spots. Rather healthy happy swimming until this plague hits...i've had four fish go this same way...I've dont a complete water change recently to add new PFS...My water params are as follows.ph 8.2 ammonia. 0 nitrite 0 nitrate 10......i have a 60-100 gallon air pump plus low water levels for airation from hob filter...Some one please help these exxpensive fish dying is making me steer clear of this hobby...