I would say your reflectors are good enough. There is no single reflector that is best IMHO. It all depends on the light spread vs tank depth and height of the reflector above the water. I believe most reflectors are optimized for a 2' X 2' spread. Since the spread you need is 1.5' X 2' you may need to do some research to find what is best and then it probably isn't worth the extra money. I believe your reflectors and light intesity are plenty good to grow any coral or clams that you want.