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@fred-koi, great photos. But sorry to hear you have issues with your shrimp. What shrimp is this?  It's showing signs of a bacterial infection. Are these brownish spots circled in red normally there?   How long have you had these shrimp? Bought recently? What is your water parameters like? Temperature too, please. Bacteria do better in warmer water, so make sure your tank is cooled.   Separate any shrimp that are showing signs like this shrimp - inflamed mandibles, and brown spots. If you are brave enough to want to further treat these shrimp, have a look at the treatments for "Rust Disease" in the Disease and Diagnosis thread. No guarantee we will save this shrimp, but you can give it a go.   

Hello, I have been experiencing a mortality problem for several months. I realize that there is a problem on the mandibles the shrimp is weak eats little then the shrimp dies. Do you have an idea ? THANK YOU

Thank you both for your help, my newer tank that doesn’t have anything does have stratum and is heavily planted (some carpet plants like Monte Carlo, anubis, java ferns), parameters are good the only issue is the temp change.  My other tank where they are housed currently has sand, river stone pebbles, and a bunch of assorted plants (java moss, cabomba, ludwigs etc)  I haven’t thought of doing tiger shrimps but I may go into that route instead if this doesn’t work for crystals. Thank you guys again!  

This is 'INSANE' and what happens when you get carried away in this hobby! PLEASE DO NOT TRY THIS AT HOME WITHOUT CONSULTING YOUR  PSYCHIATRIST FIRST! https://www.youtube.com/watch?v=xKH1ABcN6-g I would not want his electricity or water bills, let alone all the cost of the equipment.  

Putting the crystal shrimp in with neocaridina (cherr) means the setup will benefit one type more than the other and it looks like the tank is better suited to neocaridina. Neocaridina are more robust anyway, caridina are a lot more sensitive and therefore harder to keep. The parameters quoted are definitely off for caridina and better suited to the neocariidina! I'm sure that that is the reason for the deaths. You shouldn't need a heater if the house sits arount 74F (and it is unlikely to get so cold that it would kill your shrimp, especially with the other heat sources in the room) and the crystals would be ok at that sort of temperature, though the 80F is getting a bit warm for them, whereas neocaridina would be less affected by that higher temperature. Of course you also need to bear in mind how hot it will get during a really hot spell as even if they are doing well normally, if you even get a few days of over 80+ (in the aquarium though, not necessarily room temperature) that could wipe them out. You could try tiger shrimps as they are almost as tough and robust as cherry shrimps and require similar water parameters, and give a bit of variety? I'm not sure that I would try the caridina in your position due to the difficulty of keeping them and the extra costs involved, when it probably won't work?