I just added 4 new fish to my my new 80 bow front aquarium. 2 electric cichlids and 2 gouramis. The tank has run for about 1 month now and all chemical levels were normal, in less than 24 hours the nitrates rose .no2 is between 0 & 20 the no3 is between 1.0 & 3.0 the hardness is 0 & the ph is between 7.4 - 7.8 ammonia is o, iam useing a magnum 350 and a penguin 350 bio. all the proper chemicals have been added,i used the pollishing fillter for the first 4 weeks,then went to the charcoal set up in the magnum when i added the fish.how can the no3 go from 0 to 3 in less than 24 hours.any advise would be apprichiated...Weeser:huh: