I have freeze-dryed krill, sinking cichlid flakes/crisps, algae wafers, and frozen bloodworms. Which of those will it choose from? Is it OK to leave it in a tank w/ sand? Will it bother my bichir? If so should I house it with african cichlids instead and swap him with my bristlenose into a different tank? he's about an inch or two long and currently housed in a 65G with sand and two juvenile New World cichlids.