what do u guys think is better a school of 20-30 cardinals or a school of 20-40 boraras brigattae? and what would u guys think would be a good big/mediums sized centerpiece fish which are suitable with the shrimps (i dont mind abit of snacking on shrimplets but not snacking on all shrimplets and adults plz, i dont want a fish which will hunt down those shrimps/shrimplets)?