Perhaps you made the error of adding shrimp too soon before your tank matures. Crs are so hard to keep. I honestly gave up on them. Especially because they don’t like nitrates and plants need nitrates. That’s why the people breeding those shrimp have them in plain looking tanks
Forgot to add: the only change I’ve made to the tank since I got the shrimp is add a new plant and replace the built in filter with a sponge filter (the shrimp deaths already happened before I did that). I kept the old filter cartridge in the tank for 2 weeks and didn’t notice parameter changes.
I added cattapa leaves and little pines as well as chollo and it has reduced failed molts in my colony. Tannings help out soooo much. I know people like clear tanks but the tannings are really beneficial for them.
Forgive me if this is totally obvious to anyone raising shrimp – but are any bug sprays used in the house? I’ve recently discovered that shrimp are very closely related to insects (both are effectively crustaceans), and it only takes parts per billion of pyrethrins in water to kill shrimp.
I have fish, not shrimp – fish apparently are much less sensitive than shrimp.
as someone else said, you don’t have to feed them NEARLY as often as you’d think😂 even if there doesn’t look like there’s an algae in the tank, most of the time shrimp will alllllways find something to eat especially in a tank like this with real plants. gorgeous set up by the way!
I’ve been breading CR/BS snd TWB for about 10 years now. What is your TDS? This is the only factor I pay attention too when using RO water to remonetize. KH should be 0 if your using good buffering substrate and I would expect a pH 6. Do you top off with tap water or RO? Using Tap to top-off or water changes can cause a TDS creep in your tank and and result in pH swings and overly mineralized water. When breeding CRS I keep my tds at 150 but it can go as high as 200. Also, it sounds insane but do less water changes. If there’s only shrimp in there the plants, especially the floating ones can handle the nitrates and at 22C and 6.5PH those nitrates are pretty harmless. DM me if your email if you would like the CRS breeding guide I wrote a few years ago. It covers everything you need to know.
your KH is really low and togetehr with low PH it makes every small change more toxic, at least that’s what i have read. I have the same problem in my aquarium – ph and kh tend to be really low. I used couple of teaspoons of baking soda to regulate it. Also have added several crushed shells and now my ph is at 6.8 – 7, and KH around 6-8. Shrimps got preganant and so. Maybe try that and see how they are doing. Read up about it as well
Update: I thoroughly inspected the tank and didn’t find any bugs that shouldn’t be in there. I did a 15% water change with RO water, vacuumed the soil to remove any leftover food and ordered catappa bark to increase tannins in the water.
Thanks everyone for all of your input, really hope this does the trick. I’ll keep monitoring my water parameters closely.
You look like you have a similar tank to mine and I recently had a handful die. For my tank I’m thinking that the water flow just isn’t enough to keep oxygen up with the algae. I’m not sure how much algae you have but it doesn’t hurt to check into it.
It’s not uncommon for copper levels to suddenly get too high in drinking water. So, if you are using tap water at all to water change, I would have it tested.
When your doing water changes are you checking the new water temp? And pouring in slowly…shrimp will force molt if the water suddenly changes Temps even by just a few degrees..
colasinas 
Perhaps you made the error of adding shrimp too soon before your tank matures. Crs are so hard to keep. I honestly gave up on them. Especially because they don’t like nitrates and plants need nitrates. That’s why the people breeding those shrimp have them in plain looking tanks
Have you seen any molting?
Cant say what killed the shrimps, but that’s a lot of food going into the tank
for this tank size should be feeding very small sprinkle of food or none at all
vegetables are way too much
with that amount of food, shrimp population will slowly die out even for neos
get a TDS pen, ammonia tests wont test for everything that food adds to the water, but youll see TDS creep up
Forgot to add: the only change I’ve made to the tank since I got the shrimp is add a new plant and replace the built in filter with a sponge filter (the shrimp deaths already happened before I did that). I kept the old filter cartridge in the tank for 2 weeks and didn’t notice parameter changes.
Check for dragonfly nymphs, seems to be a rising issue on this subreddit
What kind of wood is that tree?
I had a similar issue. I suspected that my KH was too low so I started adding a small amount of Equilibrium during water changes. It’s helped a lot.
ETA: Just noticed that you said CRS. I have cherries so I’m not sure if this is applicable. Might be worth looking into regardless.
I added cattapa leaves and little pines as well as chollo and it has reduced failed molts in my colony. Tannings help out soooo much. I know people like clear tanks but the tannings are really beneficial for them.
Forgive me if this is totally obvious to anyone raising shrimp – but are any bug sprays used in the house? I’ve recently discovered that shrimp are very closely related to insects (both are effectively crustaceans), and it only takes parts per billion of pyrethrins in water to kill shrimp.
I have fish, not shrimp – fish apparently are much less sensitive than shrimp.
as someone else said, you don’t have to feed them NEARLY as often as you’d think😂 even if there doesn’t look like there’s an algae in the tank, most of the time shrimp will alllllways find something to eat especially in a tank like this with real plants. gorgeous set up by the way!
I’ve been breading CR/BS snd TWB for about 10 years now. What is your TDS? This is the only factor I pay attention too when using RO water to remonetize. KH should be 0 if your using good buffering substrate and I would expect a pH 6. Do you top off with tap water or RO? Using Tap to top-off or water changes can cause a TDS creep in your tank and and result in pH swings and overly mineralized water. When breeding CRS I keep my tds at 150 but it can go as high as 200. Also, it sounds insane but do less water changes. If there’s only shrimp in there the plants, especially the floating ones can handle the nitrates and at 22C and 6.5PH those nitrates are pretty harmless. DM me if your email if you would like the CRS breeding guide I wrote a few years ago. It covers everything you need to know.
your KH is really low and togetehr with low PH it makes every small change more toxic, at least that’s what i have read. I have the same problem in my aquarium – ph and kh tend to be really low. I used couple of teaspoons of baking soda to regulate it. Also have added several crushed shells and now my ph is at 6.8 – 7, and KH around 6-8. Shrimps got preganant and so. Maybe try that and see how they are doing. Read up about it as well
Your tank isn’t cycled and your filter isn’t big enough.
Whats the tds of the water?
Update: I thoroughly inspected the tank and didn’t find any bugs that shouldn’t be in there. I did a 15% water change with RO water, vacuumed the soil to remove any leftover food and ordered catappa bark to increase tannins in the water.
Thanks everyone for all of your input, really hope this does the trick. I’ll keep monitoring my water parameters closely.
You look like you have a similar tank to mine and I recently had a handful die. For my tank I’m thinking that the water flow just isn’t enough to keep oxygen up with the algae. I’m not sure how much algae you have but it doesn’t hurt to check into it.
What source are you changing the water with.
It’s not uncommon for copper levels to suddenly get too high in drinking water. So, if you are using tap water at all to water change, I would have it tested.
When your doing water changes are you checking the new water temp? And pouring in slowly…shrimp will force molt if the water suddenly changes Temps even by just a few degrees..