I'm thinking of doing some solo diving at 30'-40' off shore anyone have any tips and or advice? thanks
"Off shore"? Do you mean from a boat or from the shore? If it's the former be sure to at least have a boat person.
Buddy diving and solo diving are all safe and easy when it all goes right. When solo you have fewer resources to work with.
Even in 30 or 40 feet you can become entangled, blow a tank connection o-ring or have anything else Murphy can dish out happen. Do you think you have thought all of this through and have reasonable response plans, equipment and the associated skills? Your profile lacks any useful information.....
I would strongly suggest holding off until you have competed the Rescue Diver class. It will teach you a lot about error proofing, stress management, and recognizing a potential incident before it becomes an accident.
A healthy progression is:
1) New diver: This is easy enough, I can dive solo with my training.
2) Novice diver: I can see a lot of things can happen while diving and a buddy can be beneficial, maybe crucial.
3) Experienced diver with solo aspirations: I have a good understanding of the risks of diving. I have training, experience and equipment to manage these risks on my own.
If you are at #3 then you probably would not be asking this question today.
There is no magic bullet or singular answer to this question. It's all about personal risk assessment. Are you feeling lucky today?
Dive safe & Often,
Pete