I originally wanted to do a reef tank but now believe I'll just try a fish only tank.  I have a 46 gallon bow front.    Do I need live sand for the substrate or can anything other than that do the job?  I'm planning to just get rocks n cured coral from my local fish store for decorations.  I understand the cycling process, patience, patience etc.  The lights are a simple strip light that came with the tank so may upgrade that a little.  I will need a larger hang on the back filter for it, thinking of a large whisper.  Obviously in a 46 probably a few smaller fish of course, my wife wants a sea horse but I understand they might be too much for a semi beginner.