[I have just started an 180 gal tank and the ammonia level is not coming down I have been testing it every other day and it is still the darkest of green. How long should it take to cycle? I have put 100 pounds of live rock in it and now it is turning brown, Is this normal? I need some HELP understanding the process! I do not have a sump nor holes drilled for one.What do I need to do next.]