Wow Rob... I'm both surprised and confused about this comment. Did you used soap because someone told you or is that an established practice when you clean your fish and frog tanks? The reason I ask is because soap is a great human skin antibacterial; but a very toxic substance in aquatic environments. Nothing (brushes, pails, etc.) that comes in contact with soap should be shared when cleaning fish/frog tanks and the tank itself should never be washed with soap. If you have used soap in the past, that probably explains your fish deaths and frog ailments.