HELLO, I HAVE HAD MY 90 LTR TANK FOR ABOUT 2 MTHS ALL LEVELS SEEM TO BE GOING PRETTY NICELY APART FROM I AM HAVING A JOB LOWERING MY KH AND GH,,I HAVE A FEW LIVE PLANTS ,AND I HAVE PUT 4 ZEBRA DANIOS IN,THE FISH HAVE BEEN IN FOR ABOUT 2 WEEKS,IN THE LAST WEEK THE STONES AND THE GLASS HAVE...