i have 4 motoro stingrays between 12 and 14 inches in a 300 and im starting to build a pond for them.i have always wanted a tiger ray and a local guy is selling a female tiger ray about the same size as them and im debating whether i should buy her or not.i have heard that it doesnt work because tiger rays are shy and motoros are a little more aggressive.but some have made it work.any info?