i made the mistake of buying a 20 gallong and four cory and 4 guppys without knowing about a cycle until 3 days after buying the tank since then i bought a test kit and its been cycling for about 3 weeks im down to one guppy and three corys one is breathing heavy and most likely going to die i have two water sprites two anubius nana and two amazon sword plants in the tank there has been no ammonia for a week now and its at the nitrite stage now so when it hits over .25 i do a half water change and i do a 10 percent water change everyday or every two days i feel like giving up the plants are dying and its sad to see the fish suffer should i just pull the plug or is there anything i can do also i add the nitryfying bacteria product everyday