Its been about 2 weeks since my ammonia spiked for no apparent reason. I have done several 30 gallon water changes and ran bags of carbon. The tank water finally clearing up and was actually completely back to normal yesterday. Well today it is coudy again and I cant figure out why. There is no ammonia showing yet and I am going to do another water change tonight. So far I have down 3 30 gal changes and this will be the fourth. Cant seem to understand what is going on. Any ideas?