I have a 29 gallon tank and im trying to establish a community tank. My tank has had water in it since November 6th, and has had 4 zebra danios in it since November 9th. I have kept the water between 76 and 80 degrees. Doing 15-20% water changes every few days. I feed them sparingly and they seem happy and healthy. Now whats worrying me is i have NO trace of nitrites or nitrates at all. My ammonia is reading about .5 ppm and hasnt gotten any higher. Should i just keep being patient and do what im doing? or is there something else i should do.