One fish always chases another.
Hi. I'm new here and need advice.
I have a 10 gallon tank. I have a bottom feeder (looks like a dinosaur) who over the years has grown from 1" to 6". No one fools with him! I also have a minnow who is about 3" long. This guy is always harassing my goldfish, about 2 1/2" long. He chases him around the tank and is always "in his face" so to speak. The goldfish's dorsal fin is high, so I don't know if he's harassing him or if they're simply playing. The goldfish's behavior is always laid back. He's not an aggressive eater, while the minnow eats like a shark!
I do have a time-out cage which I have used on the minnow but it doesn't seem to change his behavior.