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love that statement. Never gets old.

But what do you use to bring up the TDS of RO water (called remineralising RO water). RO's TDS is too low for shrimps to live in.

It may or may not be an issue, but there's a chance that the GH and TDS are on the low end. It *might* help to raise the GH up to 5, which should put the TDS around 150. What are you using to remineralize the RO water with? Alternatively, maybe there isn't enough food for the babies? What food are you feeding? Any leaf litter in the tank? If we can figure out why the shrimp haven't done well in the past, then we can help you better for your current or future shrimp. :)

oh. thanks.@zoidburg@Madmerv: my tank parameters: ada soil tds 130 gh4 ph6,7 no3,no2 0 i change 20% water/ month plant: moss, bucephalandra, fern, some driftwood, light t5ho but baby crs no more. i use RO water for my shrimp tank Tds Ro = 4 Sent from my iPhone using Tapatalk

There are no "Cherry Red" shrimp. There are "Red Cherry" shrimp, though. CRS = Crystal Red Shrimp (Caridina) RCS = Red Cherry Shrimp (Neocaridina) Your GH is too low for your shrimp (you want at least 6 GH) and the KH is potentially too high for the Crystals and Taitibees. The Cherries and Ghost shrimp can do just fine on sand or gravel substrate with at least 6 GH and a pH of 7.0-8.0. but the Crystals and Taitibees would do best on a buffering substrate with remineralized RO water using GH+ only minerals. Ideally, you want a KH of 0-1 (typically 0, but 0 and 1 read the same on the API tests), or a max of 2, with a pH of 5.0-6.8. Would recommend setting up a separate tank for your Caridinas so they can live in preferred parameters.... unless they came out of Neo type parameters? Do you know the parameters they were raised in?

@nthungryan1 What @Zoidburg is saying is the shrimp do not live in the soil. Shrimp live in the water. You need to do a full test of the water to find out the Parameters. TDS, GH, KH, PH, Ammonia, Nitrite, Nitrate, Temperature. Contrasoil and ADA can change the water parameters so to get best breeding conditions you MUST tell us what water is in the current tank. Also would be a big help if you tell us what water is BEFORE going into tank. I hope that clears up the confusion.

Can you answer the questions I asked?

It's honestly up to you. If you didn't have luck with ADA, maybe you'll have better luck with Contrasoil? Or maybe not? What water are you using in the tanks?