Guys/Gals, is coppersafe...well safe to use on bichirs? my Dels just got lighter and is breathing hard. It says 1 teaspoon for 4 gallons, I only used about 5 teaspoons for the 120G tank. But they look later and scales looks like they were sucked on. Should I remove from the tank or do a quick water change? You guys think its the coppersafe or the tigerfish brought in some disease?