I have 3 tanks, my two 5 gallons with marineland bio wheel fulters are fantasic, never had an issue. But my ten gallon has an awful nitrite problem. The only difference- no bio wheel. I've tried to fix it- water changes everyday, my fish guy gave me this solution to put in and nothing, no change. My sweet betta boy is showing no symptoms. He is VERY active, breathing ok, and his gills look fine. The tank is about 2 months old I waited a month before I bought him to allow it to cycle, which I didn't even do with the other 2 those only 24 hours. So today I bought him a marineland bio filter hoping that will fix my nitrite problem. My big question is... Would it be bad if I put him in the tank right after I put in the new filter? And if so what do I do with him for 24 hours??