What kind of filter media do you have? Bacteria needs surfaces to grow, i use lava rock. Its super porous (lots of area for bacteria to grow)is inert is light and inexpensive. I just dump it right in my hang on back filter, if a canister filter put it in one of the baskets. After that i just use fish food maybe some pest snail if they die their death creates ammonia as well. I just dirty the tank up to the max and then do a close to full water change before adding fish. Might sound simplistic but has always worked for me.