I have 2 ACFs. One of my frogs was a gift and I was also gifted with a big Ziploc bag of sinking pellets that his former owner was feeding him. Both of my frogs love them and the bag has lasted me 3+ years! However, it is running low and I have no idea what kind of pellet it is. My other frog isn't bright enough to find food on the surface of the water, so I need something that will sink. Can anyone make a recommendation?