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I've never had issues with CPD being more fragile than other danio or tetra species. Might be luck, but with proper water parameters and acclimation I recently introduced 12 CPD to a 20L with no losses. The tank had been running for 3 months, almost every inch is planted, and I have 200+ Shrimp in there. The tank has been running now for almost 6 months and my CPD are conditioned to dropping eggs everywhere. I have tiny CPD fry swimming around the moss and stuff.

I use conditioned tap water that I add kH and gH powders to, my parameters are:

Temp - 70
pH - 6.8-7
kH - 3 or 4
gH - 6 ish

Forgot to mention, your tank should be fine to add both shrimp and CPD at the same time. Just acclimate them to your water.

It only takes a few months to develop enough bacteria and biofilm for shrimp but you are already there. As long as you supplement feeding with algae and small amounts of protein your shrimp should be fine.

As for CPD, nothing special. Just quarantine them, acclimate them right, and toss them in.
 

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No, they do not actively hunt adult shrimp like other fish do but will occasionally nip at the smaller ones. If you provide enough cover the shrimp will usually get away unharmed. Baby shrimp do get eaten, but when you have hundreds you don't even notice.
 
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