Hi I am in the middle of slowly stocking my tank (details shown ) Presently I have 11 lemon tetras all doing well but not that good at finding the food ! I have thirty assorted shrimp all doing well . Sadly I had 9 corydoras harbrosus wild caught which are nearly all dead .I have two left one will die and I fear the other will as well as he will be all alone . When they arrived two weeks a go they had a pink glow about them especially around the head and gill area and were not very active thats when I started to worry . I moved them all from the large tank into a hospital tank after losing three and treated them with some uni pet antibacterial (internal ) I do not want to replace them with the same kind as I think that they are just to tiny to cope with all the stress . Can anyone advise me of a smaller member of the cory family that is hardy (not the dwarf ones ) Also should I avoid wild caught fish ? All my levels are good zero ammonia , nitrate and nitrite , ph 6.5 but I am bringing it up to 7 before adding anymore fish .