I got one of the baby bettas from Petco, and it ate a bit of food while still in the cup it came in, and shortly after I introduced it to its critter keeper it ate a bit more. That was late last night. I haven't seen him eat anything today, and he's hanging out in one of the bottom corners. It still looks so skinny! Is there anything more I can do to encourage him to eat? I crushed up a couple of pellets and they are floating right over him.