Sorry for a 10 year old necro here, but I found this thread while googling for ostracods in Singapore. I noticed they seem to be the only thing that keep my chilli rasbora active and well coloured (store bought daphnia simply do not move fast enough to be chased). If anyone has specific info on how I can find and keep them, do let me know, thanks. I've tried leaving rainwater out in the sun for 2 weeks now but no success...
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