well my ph is 7.0, amonia level is o.o1 mg/L , nirtite nitrate lavel is 0.7 mg/L, general hardness is at 13. i'm using carbon filters to remove small things, my gravel is not green (yet), i do regular water changes, about 25% every 2 weeks, i only have the light on for about 1 hr every night, i try not to put it on every night. i just don't know what els to do, my fish are feeding on floating pellets, what ever is not eaten after few min, i remove it form the water. my lfs had told me a pleco would take care of it, and they don't test anyones water so i won't be able to have that done, i have 2 different test kits, the main one i use is called tetra test and the other is aquarium pharmaceuticals, i think there good. any idea on what the problem could be?