First of all....kindly quit tapping the aquarium glass please, it stresses the fish out (even moreso when the fish is not well)
Secondly as has already been said....Cories are far too delicate for an uncycled aquarium and should not be used to cycle one.
And looking through the thread(s), I have to agree with everyone in that despite giving you very good and concise advice, you have apparently gone your own way regardless, which really negates the reason for asking for help.
There are no shortcuts in keeping fish. Learn to do it properly or consider getting a different and less complex pet.