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Have you ever determined what causes them to go white? Is it missing something in their diet perhaps? Or maybe a lack of predators, so no camouflage needed?

They do not look like worms. I think they are a large ciliate protozoan that is having a population boom for whatever reason. I doubt they are harmful to the shrimp and if you wait it out the population will likely crash on its own. You'd need to put some under a microscope to identify them properly. I'd put some fish fry in the tank to eat them.

This is a nothings changed update. I now have 20-30 white shrimp in my DAS collection all doing fine but I haven't done any breeding for a couple of years as life has been busy and transitioning the shrimp in and out of salt water requires a bit of effort and attention and only works 1 in 10. Its worth noting that some of my oldest DAS are now 6 years old. I've noticed that the larvae that are released into the water column seem to be getting smaller as the years go on. Perhaps the females are losing vigour, or perhaps their diet doesn't contain enough protein. My staples are mulberry leaves with trout pellets every now and then. I've started giving them more food, more protein and more variety to improve their condition as I hope to raise some this summer before they all get too old!

Either way it does look pretty.

Definitely no tiger in him. A typical tiger tooth pattern but with red or white splotches where it shouldn't be. I reckon it's just a lower grade CRS.

A clearer photo

Not sure about releasing toxins from the rock. The temp difference from 16C to 22C isn't that big of a change that would do that sort of thing. But increasing temps and adding fresh water can trigger a moult. Keep going with the RO drip to bring TDS down to 140. When you get to 140, don't change the tank in any way for a week. Report back here with your observations.

Yeah, THOSE are fancy tigers. Notice the distinctive tiger stripes? But the one in KMS's picture is ... different. More CRS with spots than fancy tiger, if you know what I mean. Anyway, just enjoy it. But if you are planning on breeding pure CRS, than maybe don't risk it with this shrimp.

Good video, but I still don't know. They don't look like they are wriggling in the video. It just looks like flakes. Do they move/swim on their own?

these ones i bought were suppose to be red fancy tigers

and small video

I will take the montmorillonite clay out for now. I've reduced the tds to 160 now just by diluting with ro water drip and will continue to do so. I don't want to drain water out as that will decrease my gH levels which I'm trying to increase. I'm also afraid to add anymore remineralised water with higher gH into the tank as that will further stress out the shrimp. I'm unsure if I increased the gH too rapidly and the shrimp are dying because of that. It was just 1dgh/12.5ppm across 1 week. I've had these shrimp for 1.5 years now and have never seen them react this way. I've used montmorillonite clay from the same package before but it didn't cause problems for me. Could raising temperature cause toxins to be released from older montmorillonite rock I had in the tank?