So, I've always wanted a pair of rays but sadly they are extremely rare to come by where I live. However, a couple months back a nice little baby Motoro and Retic showed up on the market and I couldn't help but grab them. Fast forward to today and they live quite peacefully and happy in my 150. 3 weeks ago I managed to get a hold of a 315 gallon tank for a good price. It's dimensions are 78"L X 30"W X 31"H. I know this cannot be a permanent home for them, but I was wondering if its able to house them for maybe 2 or 3 years until I'm able to get a hold of a larger tank. The Motoro is a male and is probably around 7-8" disc right now. He's grown about 1-1.5" disc since I got him while the Retic is a female and doesn't seem to have grown at all. She's around 4" disc. They were both supposedly brought in from Columbia if that makes any difference. So based on your experiences with growth rates and such, how long do you think I have before I either have to relocate them or to find them a larger tank?