hi i'm experiencing high nitrate levels in my 60 gallon tank. approx. 80ppm. i have 3 archer fish, 6 clown loaches, 1 frontosa, and 7 new guinea datnoids(all less than 4 inches in size) i've started putting plants in the tank such as amazon sword, some other t ype of sword, jungle val, 1 java fern, some anubias, and a few others...is there anything i can do physically that will lower the nitrate levels in my tank???i also have a 10 gallon tank with shrimp and guppies and slightly planted that has a nitrate level of 40ppm...my city tap water is give or take 20 ppm...this is also true for my other 60 gallon with bichirs and an arowana which read at about 80ppm as well(this tank only has few anubias...so my main question is if there is any type of chemical or such application that i can apply to this tank to lower the nitrate levels???the ammonia and nitrite read at 0ppm and the tanks, other than the 10 gallon, have been running for over a year...the 60 with datnoids has a fluval FX5 which was more recently added a little over a month ago...i'd appreciate any tips thanks