i have a 55 gallon tank with a small pleco, a 2inch bullhead, and a 3 inch pike. my tank have been up and running for about 4 weeks now and my nitites are 5 ppm or more. i really do not wanna loose my pike and am starting to get worried. i was wandering if there is anything i could do to lower my nitrite levels. I am already doing 20% water changes everyday. when i started the tank i put 15 gal from my 75 gallon tank that has been established for a yr. i also transferd my biowheels from that tank to mine. SHould i pull my pike from my tank and put in a tank with establisheed water?