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Shrimps don't need much maintenance and 10% water change a week would be normally sufficient, though if the water was poluted (dead snail/shrimp) a bigger water change may be needed! Add the new water slowly. CRS shrimp KH 0-2, GH 4-6 and PH below 7. I would drop the temperature also to 23. As your PH is high I am assuming you may be using tap water and caridina shrimp rarely survive in that, you are best with RO water and shrimp remineraliser. You may be able to use a Zerowater filter jug to get RO water if the tank is small? Over feeding is also a very common problem in the hobby? Simon

Hi Simon, Thanks for the reply, apologies for not responding sooner. I saw lots of molts in the tank, from both the red noses and the CRS. They seemed healthy and fine. The only variation from their routine I can think of, just before the dying began, was that I got a free sample of Shrimp Snow from my shrimp supplier and gave them a bit of that. The water temp was consistently 25 degrees, it was lit and had a HPB filter and the tank was running for about 6 weeks. It was cycled, and testing showed good parameters. Reading your comments, I think maybe it was not doing weekly water changes that was the problem. Had I been more thorough, then I would have smelt there was something wrong. In terms of GH/KH, what should I aim for? Thanks again for your comments. Andrew