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It and the three others that I got at the same time have always stayed the same colour.

Interesting. My initial thought was a green jade as Simon said, but I can see how it could potentially be a chameleon. Let us know if you see it displaying any other colours or patterns.

I thought I should do an update on this. There are a few shrimps still alive in the tank but in all honesty this has not worked out as I hoped, obviously! I will just continue with the fish in this tank plus the odd surviving shrimps of neocaridina and caridina. I do have the new substrate to start a new tank but that is a bit unlikely, unless I move house at some point where it would make more sense to start afresh! Anyway, at this point I won't bother continuing with this thread, unless some miracle happens................ Simon

Hello folks, Short story - I have the same problem as last year with only certain shrimps getting shortened antennae disease. They don't grow up to be full size, and the antennae start to get shorter and shorter. After about a month they eventually die. This only affects a certain type of shrimp. For example, last year it took out 6/7 of the shadow pandas, but the 7th one grew up to full size and lived a long life. The RWP and BB were unaffected as well. I tried quarantine and treatment with various antibiotics, and even a full tank dose with one, but it didn't seem to work. This year, it seems to be affecting the 3 RWP I moved over from another tank. I read some articles having to do with industrial shrimp farming, and often they mention feeding the shrimp food mixed with antibodies. So I wonder if that is the key for making meds to treat affected shrimp, or will they just absorb it from the water anyway? BTW, I am doing the "standard" antibacterial things like lowering pH, add tannin extract, etc. Addendum: I can't get oxytetracycline in the US. Which is closer, minocycline, or doxycycline?