They are indeed pretty useless, tank size does not matter.
What has happened is that you added too many fish to a new tank and the ammonia is shoooting up. You will need to do a 50% water change at least once a day for the next two or three weeks.
What has happened is that you added too many fish to a new tank and the ammonia is shoooting up. You will need to do a 50% water change at least once a day for the next two or three weeks.