I would like to maybe add some cory cats to my tanks but don't really know if my current tank stocks would work with them or not. In my 29 I have 3 rainbow cichlids and 4 swordtails. In my 55 I have 2 cons, 1 jewel, 1 green terror, 6 tiger barbs and 2 bn plecos. And also in my 75 which contains 2 jacks, 1 jag and 2 bn plecos, I was thinking a type of synodontis or a raphael, which I used to have in there but traded for my terror. Any info would be helpful, thanks!!!