What are the actual dimensions then?
If it's got the same footprint as a 55 (which is 48" x 12") then you can do a very easy and very simply DIY using prefabricated gu10-based LED bulbs. A solid row of 23 will light a tank with that footprint and bulbs cost between $1.50 and $7.50 a piece – or from $35 to $172 for the fixture, depending on the exact bulbs you pick. I'd start with the cheapest ones and go from there. If you google a bit or search on youtube you'll find folks that've been using these....might get some ideas for your DIY. Mostly what you need to come up with is a way to mount the gu10 sockets. They're little pre-wired ceramic disks about 1" in diameter that have two mounting holes, so not hard to deal with. Can be as simple or elaborate as you want.