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Here you go. A much better video that is more recent. I have a plague of them. https://www.youtube.com/watch?v=TnyAUQ3GD3A

They looked much happier in the video so I am pleased you have got to the bottom of it and hopefully most that you have now will survive! They have a great colour. You will likely still lose the odd one I expect just down to what they have been through and the stress etc! Simon

I’m 90% sure those are just seed shrimp. They are harmless, but make for a good food source for even adult shrimp, if they can catch them. Endler fry will totally clean them out - I have evidence of this in my 5 gallon tank, which was loaded with seed shrimp and microworms, and is now loaded with 100+ endler fry, and has none of that easily visible abundant micro fauna. But endler fry will also eat shrimplets, so I don’t think it’s necessary or totally beneficial for them to be in the tank.

Oh man, I didn't see the edit until now! Spot on, on all accounts. Thanks for the info, shame I'd come to the same conclusion without seeing this. But I think really the damage has already been done, so even if I'd read this when posted I wouldn't have lost any fewer shrimp. I still have a good 100 or so, and a dozen are still berried., so they'll bounce back in a couple of months. This is the strongest, most resilient colony I've ever had, so fingers crossed no more mistakes! Thanks to everyone for offering suggestions.

Less than 30 minutes after turning the air up to 11... So in short it appears I've uncycled my tank completely, which we'd already established. The difference between this and a brand new tank is that I've also got a load of organic matter in, which most new tanks won't. The new cycle has caused a PH drop, and the bacteria bloom has used up so much oxygen the shrimp were suffocating. The PH drop isn't ideal but it seems the oxygen (lack thereof) was the killer. As I said I have seen shrimp unhappy with the water params, most often PH swings, and they tend to swim (fast) to where they think the water current is coming from (ie upstream - probably their instinct from wild). This was different... never seen them throw themselves completely out of the water and hang half in, half out the water, not moving. So there's two different reactions for two different problems. I'm glad they are back to being aquatic rather than semi-submersible. Fingers crossed no deaths tonight.

If I can keep them healthy and alive I will order another group. My blues are doing amazing. I bought some and didn't see more that one or two at a time. I though they were just a few left. Then last week I see little specs and when I looked closer I had some babies all over. Now I see about 4 or 5 adults at a time.

Try to get a RO or a cheaper version Zerowater, dechlorinator for water may contain chemical not suitable for shrimps, water kept overnight won't help with shrimps.

Here is my take, when you do water change, how do you add water to the tank, the best way is to do drip water, and when you added Hydrogen Peroxide, you need to have to filter on, all medication added to tank will reduce oxygen, so a filter needs to be on, what is the temperature, seeing the video, it isn't normal, shrimps don't scatter at the top of the tank, could be lack of oxygen.

I can't understand either. Loosing 1 or 2 kh a week is "normal" for me, but over 6 hours today it's gone from 6 drops to 4. They only seem to be dying overnight when the PH goes under again - presumably from the plants releasing CO2 (along with my other problems). I'm going to move them out I think. I fill 5l bottles from the cold tap and either leave them overnight or, in an emergency, set them in hot water to warm up. Then add some dechlorinator and I have a water pump in my hood that moves ~500ml per minute through an airstone buried in the tank. I get what you mean RE medication but I don't believe it's true for Hydrogen Peroxide. It's not a medication, it's an oxidiser and breaks down organic matter (including friendly bacteria in the filter). I used a syringe to spot treat some BBA. I've never had issues doing this and leaving the filter off for an hour + doing a water change but just because it's worked before doesn't mean it always will! Temp is 22c, but yeah it's possible that lack of O2 is a possible cause as maybe the bacteria bloom is using all the O2... Nothing I can do to test the amount of O2 unfortunately. At night a valve opens which injects air into the stream using the venturi port on the filter outlet so it should be helping any O2 issues. Edit: The shrimp in the bucket are now doing the same thing, trying to climb out, and I've slowly added 80% it's volume in fresh water over the day. So perhaps, in addition to the bloom, there's something in my tap water?