I'm looking to get Spock a new toy because I caught him biting his tail and I think it's out of boredom (he's been more energetic ever since I changed his diet). He does have a decoration and two plastic plants in his tank, but he doesn't pay attention to them.
He seems to like things that move. Like if I put touch the tank, he'll follow my finger, and he'll snap at the water that comes out of the water filter, and he LOVES when he can see the fish in the other tanks (but the others don't like that, so I have to put paper between their tanks). I tried putting a mirror next to the tank to he could play with his reflection, but he didn't seem to notice.
Can anyone recommend a toy you think he'd like? His tank is between 1.5 and 2 gallons.