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Not sure how it’s an all new set up. I don’t like heaters as they sometimes fail and cool the tank but I have 5 shrimp tanks in one room and the window ledge is all the room I have left for now for the smaller 6 gallon tanks

I wonder if it could we something we can't test for such as a bacteria or a virus. Any chance some kind of pathogen could have gotten into your system?

I never use heaters but it’s getting cold here in New York and these smaller tanks are on a ledge in front of a window so temps were dropping to 68 so I added a heatah

2 more deaths both crs Came home today exact same params so I took 2 sponges from my successful neo tank and squeezed them into the problem cardinia tank and hope this helps... Picture is from neo tank The water is stirred up from removing the sponges. It’s usually crystal clear This is my successful other cardinia tank . Always stable

This is a bit of a serendipitous project. I've been breeding Darwin Algae Shrimp (DAS) Caridina sp. NTnilotica for a while now using salt water algae cultures to raise the larvae. I'm up to the F3 generation (since I got them from Aquagreen) and have raised a few hundred shrimp. The normal colour is the horde in the photo below (swarming on an algae wafer)...but recently I've noticed just a few berried females that are white with metallic eyes. I thought at first it might be that they have just moulted - but the saddle suggests otherwise, and tonight I isolated one that has released swimming larvae (I caught a few to try and rear) - so she has stayed white for long enough for the larvae to mature. All up I only have 3 white females and 2 males ... but hey thats enough! The males are just clear, but have the same eyes which really shine when viewed at night with a headlamp so easy to identify them among the herd. Of course I don't know if the colour (or lack of colour!) will "stick" long term in an individual shrimp or whether it can be passed on... but only one way to find out...

Fairly safe to say its genetic as they are visibly different from settlement then the white becomes more obvious in the females as they saddle up get berried. It seems to be a mutation that results in a total lack of pigment that is retained for life through successive moults (both male and female). I've had white shrimp release viable swimming larvae but I didn't get them to hatch.. but that's not unusual - successful rearing is elusive at the best of times.

This one above is a mature female (right). The others are all normal DAS. There is a little juvi "platinum" just behind the tail of the big one exiting stage right. Pic of the juvi below with normal coloured I had the white ones separated but needed the tank back so for now they are all in together but when I give away or sell shrimp I make sure I keep the white ones. :P

In daylight without the eye shine... what a beauty! I think this is the same shrimp as in the first post above. She's released the larvae and been re-fertilised or was still packing sperm from before (I think shrimp do that) and the saddle has become another batch of eggs. You can also notice she has not eaten (head and gut is clear)...hopefully not a problem. I'm assuming for now that after a shrimp moults it doesnt eat for a while until all the "eating bits" have hardened up... at least that seems logical to me. Compare to the shrimp below.(terrible photo sorry!). This one below has the clear body and white eggs also and I think that brown smudge at the back of the head is the stomach and you can see the "poo chute". If not eating I expect it would be pretty like the one above - its something I'll watch for! Nature is cool.