On sat I put 6 of these in a tank with 6 endlers. I bought some very fine granule food. I've fed them 3 times, but only seen the endlers get the food as it sinks. The galaxies are a lot shyer, hiding when I approach. Their bellies look a little sunken and I'm worried they're not eating. I've read they prefer live food, what would be small enough and would it stay alive in the tank until they ate it?