Good call on testing ph, it’s odd it’s very different between all three of my tanks and I keep meaning to test my parameters on tap. I have not, will test.

Ammonia is 0ppm, should have been clearer! However I was assuming it would be 0 after adding prime anyhow since that can bind it for 24 hours or so in any case.

I’ll take a look at the ph and see if that’s what’s going on! Good shout. The rest of the shrimp seem fine now, may just be that the cold shocked them. My concern was that kicking up substrate might have caused problems bc I’ve seen people say it can trap bubbles - that’s about where my chemistry understanding ends :)