Okay, I thought my tank was cycled after several weeks. 0 ammonia or nitrites. After adding fish (I think too much too fast) the cycle started again. It has been 4 weeks and I thought I was getting somewhere when my ammonia was dropping and I noticed nitrites and some nitrates. After doing a water change yesterday we are back to .5 ammonia, 0 nitrite, and 0 nitrate! This is a 180 gallon with a mega flow 4 sump system. I have been adding ammo-lock and seeding the tank with safe start bacteria. Any thoughts or advice?