I created this thread to answer and ask questions for compatibility of fish in a 100 gallon enviornment. I have a 100 gallon tank, adequately filtered including uv filtering, cycled, and all chemical levels are quite perfect. temperature holds a perfect 74 to 76 degrees F. I am stocking 2 angel fish (Seem to be paired and go everywhere together), 5 Bala sharks, 3 Tiger Barbs, 2 Redtail sharks and one rainbow shark. Plenty of live plants, rocks and hiding places. Here are my questions. Why is my rainbow shark constantly being chased by one of the Red tail shark? Also, is there any other concerns about my current configuration of fish?