
Originally Posted by
madness
ADA has been demonstrated to make some substrates that are very good for shrimp keeping - especially for the softwater shrimp.
Obviously shrimp don't need plant nutrients but the ADA soil tends to be very good at maintaining a stable low pH in a tank and also in softening the water. The soil is designed this way because plants tend to grow better in these conditions (low pH, soft water) and it is just a lucky bonus that those conditions are also good for CRS and other caridina cantonensis species. In Asia they have a lot more shrimp specific soils and there are probably some that don't have nutrients for plants but still maintain low pH/soft water conditions as well as ADA substrates at a better price but in the US there aren't really other options that are significantly cheaper or more reliable so people just stick with ADA substrates.
A full ADA substrate system clearly is NOT needed for shrimp tanks as you are primarily using the soil for its ability to maintain a low pH and not for its ability to grow plants.
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The reason that the first response questioned your choice of ADA soil is because Cardinal shrimp are Sulawesi shrimp and they require very specific water parameters which are actually on the opposite end of what shrimp like CRS require.
Cardinal shrimp require high pH so rather than a pH lowering substrate like ADA soil you would actually want a pH raising soil like African Cichlid soils or crushed coral substrates. I don't know exact type to recommend but you want to find something that will help you maintain a pH at 7.0 or above. Some people have kept them with ADA Amazonia substrate but the pH still stayed at or above 7.0 which means that they must have had REALLY hard tap water. If you have good tap water or use RO then you may really have trouble keeping a pH high enough for Cardinal shrimp when using ADA soils.
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