mmmm.... then all sounds well, despite the somewhat anomalic circumstances. however.... it would be wise that you not add any more fish IMO. wouldnt want to disrupt the current equlibrium.Yes I check the water parameters regulary. They are all fine. I don't mean to sound mean, but you don't know what my cory catfish do. They are very active and I can test it because my fiance has a ten gallon with 4 cory catfish and mine are more active then his. I have done this for 3 years now and on another post of mine, people told me that it would be fine. But I appreciate your concern