Shango, If you have a test kit, I'd check your tanks at home right now. I bet you're already hardening your water to 15 or 20 dGH with the cuttlebone you've got in your filters. For my African chichlids the hard water is created by crushed coral and limestone in the tank decorations. All that I do for water changes is siphon and refill from the tap. The leaching takes care of the rest for me. So it really can be a simple problem to deal with if the fish aren't super sensitive. Jesse _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member