my mom just got rid of all her old beanie babies...and had 10 plastic cases left over... i saw at my pet store they have betta fish in what looks to be the same containers top on and all... my question is... is this ok to do?... besides for gravel do i need anything else? what do i do about cleaning them.. i plan on putting 5 individual ones across with a light from an old 10 gal. tank above them... any suggestions?