Hello.200g is a big tank to go with canisters best thing is to go with a sump.If by any reason you cant, i would put 2 big canisters like Eheim pro3 2080 or Fluval FX5 (preferably the Eheim).The number of fish you are considering are more than ok but still i wouldnt go for less than 2 big canisters at this size.