have red on a few websites that is possiible to keep rainbowfish in brakish water ane ideas if this is possible and if so which species?

i have kept the new guinea red rainbow in brackish before with puffers archers mono's and knight gobies and they were fine.i wouldnt feep any of the smaller rainbows in brackish though.

even if they were the biggest fish?

if they were the bigger fish i dont see a problem but google the specific species your looking at keeping and see what ya can dig up as i think there are a few that like acidic water but i have kept lots of different types over the years in all sorts of conditions and thay are very hardy and adaptable in my opinion

are there many different types of Rainbow fish here in NZ... are the common