I have been having issues with ammonia and nitrate levels in my tank, They didn't seem that high so I wasn't too worried. I had .25 ppm ammonia and 5 ppm nitrates. I have been told to tub my axie and I have been told not to. Today my levels are 0 ammonia and between 5-10 ppm nitrate. Is my tank recycling or something? This tank has been running for over a year. Do I tub him and if so how long? Can he be in a tub indefinitely?