if it is 18 deep and at least 48 long, you should be able to fit a larger type pike if you'd like, maybe a Johanna or a something that does not get bigger then 12 or 14 inches max. But yeah, like Rob said, a nice Sax pike would work really well in there. They get about 8 to 10 inches and have awesome coloring when they mature, shoot, look at Robs old Sveni.