I had a 46 bowfront with a single halide. And yes you get this horrible shadow. My fix was simple and did'nt break the bank. If your tank is full drain it at least part way. Use a wide bar clamp with rubber grips and set it so it just holds the tank from bowing, too much and you'll break it. Cut out the old brace. The replace it with a clear one. I made my new one from some plexi I bought at home depot. I used some thick nylon bolts and silicone to re attach the new brace.
If your tank is empty it alot easier but mine was full it took like 20 minutes and it was done and back up and running I left the clamp on for a day to let the silicone dry.
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