It just will not go down no matter what i do. the only fish in the tank is a 13 inch tsn in a 55. tank has been up and running almost 2 months now but never seems to get the amonia below 2.0. I have been doing a 5 to 10 gallon watter changes on every two day basis for the last 2 weaks with no results. tank has a standard 2 large cartrige filter systen. have even tried filling cartriges with amonia rocks but no luck there.
any suggestion is welcome
side note if it matters a 10 gallon tank with 2 2inch ciclids was set up around the same time in the same area and it cycled fine. and so did the 30 gallon oscar tank sitting next to it with a 5, 4 and 2 inch oscar. also in all the tanks only leathery or hard thick leaves plants seem to live and grow. anthing else dies in less then 3 to 5 days.
Ps
tsn is moving to a 120 in a weak so back off on the tank size coments for now
any suggestion is welcome

side note if it matters a 10 gallon tank with 2 2inch ciclids was set up around the same time in the same area and it cycled fine. and so did the 30 gallon oscar tank sitting next to it with a 5, 4 and 2 inch oscar. also in all the tanks only leathery or hard thick leaves plants seem to live and grow. anthing else dies in less then 3 to 5 days.
Ps
tsn is moving to a 120 in a weak so back off on the tank size coments for now