I currently have 18 Barbs (12 tiger 6 black ruby) in my 60 Gal. tank. I would like to add a rainbow shark or a red tailed shark to the tank because mostly because I can make idle threats about feeding foes to my shark tank. I have been told the rainbow and red tailed sharks are bottom dwellers and will be okay with the barbs but some reassurance or even suggestions of some more appropriate larger tank mates would be very helpful. I would like to have room to more smaller fish eventually to the tank and the relatively small adult size of these sharks is important.