I've had my 75g set up for over 3 months. I have an fx6. (yes I know its overkill) I borrowed one of my friends big sponge filters when I first got my filter set up and squeezed it into the aquarium. I'm doing a fish in cycle with 3 goldfish. My bacterial bloom happened just a little bit after I added the BB from the sponge filter and the goldfish. But I am still having ammonia readings and I've not yet had any nitrite/nitrate readings. And I'm honestly just frustrated and at a loss of words. I feed the goldfish roughly once a day. It's a barebottom tank, so theres really nothing causing the ammonia. I've been adding either stability or quick start since its been set up. I tested my tap water to make sure theres no ammonia, and theres not. So I really don't know what to do. I do atleast 1 weekly water change.