I cooked up some Repashy Soilent Green gel food, and while it was still hot, poured it over the rough surface of this rock. Then I placed the rock into the fish tank and watched them figure it out!
They could all smell the food immediately, but it took them a while to figure out how to eat it off the rock. This was a lot of fun for the fish … and for me!
The ancestor of the goldfish is a river-dwelling carp that scavenges for algae on the river bottom, so this is a really fun way to simulate their natural foraging behavior in an aquarium.
It should be noted that I didn’t let them eat all the Repashy because it was way too much for one feeding. After letting them graze for a little while, I wrapped up the rock in cellophane and put it in the fridge for later.