Hi all. I have 40 gallon (151Liters) breeder tank that i am trying to cycle. I set it up on 8/22/20. I have Sunsun 404b with sponges and lava rock for filtration. I waited about a month before adding fish. I started with 12 minnows to test for survival (cruel at its finest, I know) Only one has survive. I have been testing the water once a week with API master kit. the ammonia has not increase nor nitrates. I no plants in the tank. Suggestion are welcome.