I am considering buying a 48" by 48" by 13" tank and was wanting to put a stingray in it. My lfs that I have trusted for many years has had a pair of beautiful motoros in for several months and says that not just one but the pair could live comfortably in the tank for life with an adult disk size of 14-18". This is inconsistant with what I have been reading on these threads. The tank would have a sump to start off with and then I would add a large canister filter in the near future. I wanted to hear what you experienced stingray folk have to say on the matter before I do something crazy.