If you use a strobe, you need to cover your camera's internal flash (if your housing doesn't have a bulk head and the strobe is triggered by the built-in flash).
What I did was cut out the case of a DVD case, and turn it into a cover. I cut out small strips of velcro and stick these on the cut out plastic and on the housing. The cover is retained by a thread connected to the housing.
This way, I can still use the internal flash by just removing the cover in case my strobe runs out of power or when I might want to do TTL with macro shots (I use an Ikelite manual controller).
The picture below will give you an idea.
What I did was cut out the case of a DVD case, and turn it into a cover. I cut out small strips of velcro and stick these on the cut out plastic and on the housing. The cover is retained by a thread connected to the housing.
This way, I can still use the internal flash by just removing the cover in case my strobe runs out of power or when I might want to do TTL with macro shots (I use an Ikelite manual controller).
The picture below will give you an idea.