I currently have two bala sharks in my 55 gallon fish tank. they are still small and i know they can get large. i was thinking of also buying about 10 tiger barbs to live in the tank. as far as i know the tider barbs and balas should be fine together. and im also expecting the tiger barbs to die off of old age before the balas are full grown. Will i be overstocking my tank? Also how long should i expect the tiger barbs to live for?