With the sump you are going to have you can do a DSB in part of it.You can fix that leak in the sump with weld on (inject it into the seam)I don't know witch one to use I think its 4.You can also do what Jnarowe does he has a DSB witch he can close off from the system when it requires maintenance.He also has placed the rock in his tank and sand around the rock but in the front part of the tank.He sifts the sand for detritus and replaces some of it every so often.Its more easy to maintain that way.You can also get a de nitrate reactor with will help.I plan to get an H&S model later on.If you plan on BB then you need a lot of flow.If your not going to keep sps then you won't have to worry as much.SPS are more finicky when it comes to clean water and maintenance.
