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Is there any reason you do so much water changing so often? 50% every few days seems like overkill, and I would be worried about all the water changing constantly stressing the shrimp.

Are there fish in this tank? Or is this going to be a shrimp-only tank? Is the tank planted with live plants? What is your substrate?

Presuming this is going to be a shrimp-only tank, if you can keep the pH stable at around 6.5 or just above, it would make a nice set-up for a Caridina tank, something like:

  • CRS (Crystal Red Shrimp)
  • Bee (sometimes called Black Bee, or Crystal Black)
  • Tiger (including any of the varieties like Super Tiger, Blue Tiger, or Red Tiger)
  • Bumblebee

There would be some others as well, but those are the most commonly seen acidic pH loving shrimp in the hobby. None of those are necessarily beginner shrimp, though, as they are a little on the sensitive side.

Your other option would be to forget using any RO water at all and set up a tank for hardwater/alkaline shrimp. That would be less work on your part, it would probably be easier to keep the water paramenters stable, and would allow you to set up conditions perfect for the easiest of the easiest shrimp in the hobby, the Neocaridina shrimps:

  • Red Cherry Shrimp
  • Yellow Shrimp
  • Snowball Shrimp
  • Blue Pearl Shrimp

Any of those would thrive in harder water with a pH in the upper 7's. My tap water is almost exactly the same as yours (pH = 7.8, GH = 11, KH = 5) and I've recently set up a tank for Blue Pearls and the ones I got are thriving and two of the females are already berried (carrying eggs), so in the next couple of weeks I should have my first two batches of shrimplets in the tank.

Oh and just as a note, in both of my lists above, all of the species listed are known (or presumed) to hybridize/crossbreed with each other. So that means you want to pick ONE of the species in the list, not a bunch of them.
 
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