how old is the set up you have? panda corys are considered by a lot of people the most sensitive of the species.
a month old, im new to this, what happend was sum1 dyed,and nobody wanted the fish, so i took them , the tank they were in was a 10l tank,no light,no filter,no heater, and was stocked real heavy ,2,pleco s 3 guppys 4 plattys 2dalmation mollys 2 neons 5 zebras, unbelivable, anyway, i bought a secondhand tank,BIG MISTAKE, tetra aquart 60l tank, i bought a fluval u2 filter,plus heater ,thermomater.,,ii didnt cycle the tank, coz the fish were dying by the hour, so i put them in the new tank,withe filter etc,as i thought it was best for them,big tank,etc , i lost 2 dalmation plats,i other platy,2neons ,3 guppys, i took the plecos tom lfs . so now i have 1 pepperd cory ,1 albino cory ,5zebras 4 neons ,3 platys 2rummy nose tetras, i wana go get a fish or 2 today ,but dont know whether to get corys, more neons,rummy nose tetras, what would you do, am i over stocked, my light has gone on my tank,so now im picking a tank off internet today,i fancy 60l to 100l tank,any suggestions, thanks.kevinjames