I replaced the gravel and fish in my 55g a while back and have since began to add fish to the tank. As of right now I have an ornate bichir, a royal pleco, and my uspidedown cat fish I've had for about 4 years now. Just the other day I added 7 very small tiger barbs to the tank. My question is I would like to add some black ruby barbs as well, would these two schools get along or would the tiger barbs be to agressive? If they will not get along I will just add more tiger barbs. let me know what you guys think.