Hello I'm have had a 100 litre tropical tank now for about a month, I have 6 neons and 4 ballon Molly's but went to local fish shop last week and my ammonia level was at 0.25 my ph is 7 and nitrates nitrites are at 0. They told me to do water changes for a week for ammonia then go back but it's still the same so been told to do it for another week with quick start? Has anyone got other suggestions?