Nice to see you've gone BB
One good thing about BB tanks is that you can siphon out the crud from the bottom. In our three BB tanks (37g, 67g, 120g) we leave room on the sides and around the back so we can baste the crud from under the rock and siphon that stuff out too. You might want to consider reaquascaping to be able to get the crud out easier.
Good looking start, though
To show you how much room we usually leave around our rock, here's a pic of our 67g from last summer...
