I have a new tank with 5 guppies in it. I tried feeding them flakes and they ignored them. Then i got small pellets ...and theyre going nuts eating them - but ONLY from the bottom. I havent a clue why..and never heard of guppies as bottom feeders. They arent interested in dried bloodworms at the top either. Can someone advise me on this - and should I be worried if theyre eating fine - but from the bottom? Thanks,