Poor fish... :unsure:
you should've cept the Guppies and the Platy in a seperate tank, i'm not sure about the shrimps :unsure:
Best of luck with the two remaining Guppies and the Platy :good:
Daphnia usually have eggs inside them, they are usually green.
Another suggestion: it could be a blood clot...
Whilst chasing the Daphnia, it could of ingured itself :unsure:
Fish dont die after 2 weeks...
Hmmmm, this is hard, maybe your not feeding the fish the right food, or your serving to much or too little! :unsure:
I feel sorry for your fish, maybe you should by different breeds of fish this time :rolleyes:
"the back halves seem lower, hmmmmm..."
"I think there tails are heavier than the body (not being funny!) "
"I havn't experienced that to my fishes before..." :unsure: