I've been having my motoro stingray and florida gar in my 140 for about 3 months now and all has been good. My neighbor was breaking down his tank and had a large angel fish and a large red-fin shark. He was going to throw them out! So of course, I had to take them. The red-fin shark is doing its own thing in the corner of the tank near some driftwood, but the angelfish has me worried. It seems to be stalking my stingray. Keeps a 2-8 inch distance, and hasn't nipped yet. But of course this has me worried. This fish actually swims around tilted because it always has its eye on my ray. I'm just wondering if anyone else has kept angelfish in with rays succesfully, or if this presents a problem. Thanks to all!!