I have to agree with Liam. I experienced the same problem. Random shrimp loss with bad molt. My 2 years old Amazonia tank are much more stable. Now I will have to tear down 6 Akadama tanks that I just set up about 6 months ago . I'll redo them with New Amazonia. No more Akadama ;/
Liam check your PH meter.I almost kill all my shrimps because of failure PH meter.
My Akadama is 6-8 months old and it is buffering to 7ph. Iím adding tennis bal size peat moss per tank and it keep PH 5.6-5.8 for 50-60 days.
When I started the tank substrate discharge GH just a little bit. I have 2 tanks with it one CRS and one CBS
There are 20-50 babies in each. Will see how they will do in future.
I tested with liquid because I didn't believe my pH meter. It was really that high. Like I said before it was empty of shrimp, just had plants in it. I took all shrimp out a few months ago because they were steadily dying. Good thing too, pH went through the roof!