My larger fish are not eating the Gel-Tek medication?
Larger fish have a tendency to overlook the small Gel-Tek droplets in large aquariums. We recommend mixing Gel-Tek with your fish’s favorite flake food or pellets. To help keep the ingredients together, put them in freezer for a few hours to allow the mixture to lightly harden. For extremely large fish, try a medical syringe (with the needle removed) or kitchen baster and inject the Gel-Tek directly into the mouth of the fish.