If i remeber there turn into pinkish red if i remember. If some body else spray insecticide all my shrimp will died but my neo is fine, I use also diy mimerals for them (neo) but they are fine. My problem is the caridina yes they can survive a month but later on they slowly dying.. and now im doubting in the substrate that i use because i have a friend that i gave him my diy minerals and the shrimp is fine. But the problem he went to a vacation he not take care of his caridina so that the shrimp died. But he use amazonia soil. So that now im planing to change my soil if my new cycled tank is not successful.. i hope they survive now because i properply cycled it.. but it hurt so much to me i feel the pain that i loss my caridina ðŸ˜ðŸ˜ðŸ˜