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Hi All, I require assistance from your expertise. I am a relatively new shrimp keeper, recently I have had a massive die-off. I am keeping my shrimp tank at around 23 degrees celcius, 0 nitrites and nitrates. GH is around about 90. PH is around about 5.5. I had treated the water with seachem prime prior to adding the shrimps about 3 weeks ago. I noticed that one of my shrimps had a huge brown hole in its carapace (as attached) before it died. Could anyone please help me attempt to diagnose why they are all dying? Thank you so much, any comment is appreciated.

? OMG, that's the biggest hole I have ever seen on a shrimp. What shrimp was it? Cherry red? Did you other shrimps also have brown spots? And did it have other brown spots in other locations on it's carapace (shell)? On first diagnosis based on the one photo above, it is most likely Chitinolytic bacterial disease. And if you have Cherry shrimp in a tank with low 5.5pH, the shrimp might have weak immunity due to keeping it in a pH range outside it's comfort zone. Cherry shrimps do better in 6.8 - 7.0 pH. What type of water do you use? RO? Tap? If you use RO, do you remineralise it with Calcium/Magnesium? I see you have a bare bottom tank, so it's not planted substrate that is pulling the pH down. Are there any more shrimps in the tank? Sorry for the questions, but we need to get an idea of your situation in order to give you any advice. LOL, we post very similar questions within seconds of each other.

Sorry to hear you are having a problem, but wecome to the forum and shrimp keeping. From the PH and GH it appears your parameters are more suited to caridina shrimp than neocaridina? Did you acclimate them over many hours with a dripper? Did you do a cycle with the tank, that low PH may have caused a normal cycle not to happen? How long was the tank tunning before the shrimps were added? Are you using RO water and remineralising? Do you know what the KH of the water is? Usually neocaridina are quite adaptable to a wider range of parameters but a PH of 5.5 is probaby too low, as is GH 90 (thats almost 5 I believe) which should be 6-8 range. Of coarse I am going by the picture so ASSUME the shrimp are cherry (neocaridina)? Simon

Yea it just ceiling light that making it wash out when taking picture. Also i just feed some bacter AE and shrimpfit+ so all shrimp is hiding around the sponge eating

I see , is the water white or it's just because of the light?

We do have blue rili shrimp in Taiwan(P1)? (guess it's pretty rare in US?)Just remember don't put the different colour type together ,their baby will return to the original colour(P2) In Chinese , it's called 返祖 , basically it's because if you put two shrimp with different colour gene together , their baby's gene will be very unstable ,eventually the baby shrimps will all return to their original colour (black)^_^

My tank is 60P(16~gallon). Here link i kept Blue dream with the red devil but probably move them out later. The blue dream in cardinia parameter is doing amazing to. I have about 6-7 berried blue dreams at the moment. https://photos.app.goo.gl/ahCZfDvPWfwBn16G8

My water temperature is stable at 72-74F (22-23C). I feed them powder food and bacteria like bacter AE. I was thinking about moving them to breeding net that might be good idea. My first issue was that right after they release the babies they tend to molt right away and get berried again so if i keep them in nets they might not get berried again. The tank is in my office so i dont get to see them over weekend. My first berried OERD held her egg for over 35 days to the point where she molted and some eggs was still attach to molt. I will order a breeding net and see if that help. Thanks!