I've got two 29 gallon afican ciclid tanks. both have crystal water. both are well-established for over a year. fish are health. problem: the tanks both stink. they are in separate parts of the house but they both smell terrible. we do a 30% water change every 2 weeks. ph is high (8.2 - 8.4) - like it should be for africans. we use start right to treat the tap water before adding. what the heck??