I am thinking of getting a redtail catfish 5-6 inches, and getting a spotted gar with it once I get a 250 gallon tank setup, then building an above ground tank outside in about 6 months. Should I not get the redtail? Or would it become large enough in a few years to just swallow the spotted gar? Should I opt for an alligator instead? Would a 20-24 inch spotted gar be eaten by a 36-48 inch redtail? When that time of growth comes or even sooner? Does it sometimes depend on the catfish itself and how it behaves? Would the gar be too narrow or aggressive possibly and catfish doesn't eat it? Or would opting for another catfish other than redtail be preferable overall? I'm most likely building a 1500+ above ground tank in about 6 months. No worries on tank size from what I read but really don't know if its the right choice. Thanks