10-08-2012, 01:35 PM
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You should be able to cycle a tank in 4-6 weeks.
If you're at 3 months, there's something wrong in that you may be doing something that inhibits bacteria colony development. Are you conditioning your water properly before doing water changes (even slight amounts of chlorine can stifle bacteria)?
Are you only rinsing filter media in tank or treated water?
You might consider adding a few bunches of floating plants.
You might also consider using one of the bacteria in a bottle products such as Tetra SafeStart, Seachem Stability, API QuickStart, Dr. Tim's one and only, Aquabella...
Also, ensure that you use the API Master Freshwater test kit, it has not expired and you shake the regents and follow the instructions very closely. Note that regent #2 of the nitrate test requires EXTRA shaking to ensure it is well mixed.
Hope some of these thoughts helps some. Keep us posted.