I'll start with the history before I get to the question. A relative perchased a 1.2 gallon tank for my 2 year old niece and put a male betta and an African dwarf frog in it. Knew nothing of the nitrogen cycle or even basic general care of the pets. Both betta and frog got sick and I started doing research and eventually they got a 5.5 gallon tank and put the fish and frog in that. The frog developed dropsy and so I quarantined it to the 1.2 gallon tank where it died. Now the fish is solely in my care. I was able to do a fish less cycle in the small tank and have monitored daily the 5.5 gallon tank. Then another relative got three neon tetras and three zebra danios per the advice of a petsmart employee. The fish were added into the 1.2 gallon tank to be quarantined. But the ammonia went crazy at the beginning of the second week so I acclimated all the fish in the 5.5 gallon tank and they are doing great and all get along great. They even "piggy back ride" on the betta sometimes. But the tank had not finished cycling. I added the filter and plants from the established tank hoping it would help. I have a ten gallon tank filter on the tank as well as a heater. There has been an occasional hint of nitrites and nitrates hold at 5.0. Ammonia will spike to 2.0 sometimes but holds at 1.0 mostly. I do daily water changes to try to keep Ammonia down as much as possible. I know the tank is overstocked but this is the best I can do for them until I can get a larger tank which won't be a while. Now to my questions: Did I make a mistake by adding the filter and plants? Are the Nitrates eating the nitrites before they are able to grow enough to eat the ammonia? How can I help the nitrites grow? I've been using a bacteria supplement, is that adding to the problem? I cycled the small tank without it but was told it would cycle the larger tank faster and be safer for the fish. Been trying to cycle the tank for over a month. I'm sorry if all my questions could be answered in other posts, I just couldn't find any. Don't know where to look. Any help will be greatly appreciated!