I have been going to Wal-Mart and buying ro water do to mywater changes on my 150 gallon South American cichlid tank. But I have wellwater at my house I have used it in my aquariums in the past. But it smells likesulfur and it leave this white stuff along the lid and all over the equipment aroundthe surface of the aquarium. Now the question is would it hurt to start usingit in my fish tank or is there something I can add to it to make it a littlesofter for my fish tank without buying a ro unit