Two months ago I lost 2 tiger barbs and 2 neon tetras to some mysterious illness. I now have 4 barbs, 4 serpea tetras, 1 neon, 1 dwarf fame gourami, and 1 common pleco in a 20 gallon tank. I dont think I will be replacing the neons, but i would like to add more barbs. Question is I've had these barbs for almost 3 years now and they are much larger than any I'm going to find at my LFS. Do you think it would be wise to introduce some new smaller barbs to my older much larger school? Btw does anyone know the average lifespan of tigerbarbs? TIA