help!!!! my corys look sick

Actually I was thinking of getting some amano shrimp. I didn't know if I should get any though unless I get rid of the cories, I think my bioload is close to full especially once I get my last ram. I have heard that shrimp don't add to the bioload worth considering and that people will keep them on top of there fully stocked fish. If this is so then please let me know cause I would love to get some shrimp even if I do keep the cories.
 
I keep amano shrimp and corys together. No problems there. They must contribute something to the bioload since they always get their share at feeding time. I really don't know if they add the same as fish, based on body mass.
 
What is the temperature of your tank? Some pandas do not do well above 74. Its funny that u mention pandas because this summer i purchased some from petco and each group i got died a few days after I got them. I have a well established tank and the water perimeters were perfect. Out of 8 pandas only 1 survived. The next time I came in i saw there were dead ones in the store tank. I got my money back and have avoided petco since. I don't know if it was petco or where u got your fish or if maybe there is a disease affecting panda cories right now.
 
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