sorry iknow i am new to the site but help is greatly needed. i have a 125 gal tanki think i have 3 pacu's 14" 12" 7" 4 red tails fom 5" to 8" 2 lg placo's bout 14-16" 1 flower horn bout 8" 5 managuancie none bigger that 5" sorry if i miss spelled 2 small cat's dont know what there are and 2 6" oscar's ...... well to get to the point i dont have a test kit but my pacu's lips are swollen and most of the fish are also at the top of the tank like there gaspin for air they have bin like this for about 3-4 days now i have done many water changes and they only stop actin funny for a few hours then back to the same way....please please someone please help...