I moved this to the solo forum to prevent some of the conflict that would likely occur if it were left in the basic scuba section. It will also give you a higher percentage of supportive/helpful answers as the audience will be mostly solo divers or persons interested in solo diving.
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It's a rare treat to find a buddy with the patience, good sense, and buoyancy control to just hang quietly, breathe softly and not stir up the bottom and/or scare the fish.
That's one of the big reasons some people choose to dive solo. I often go off on my own to just hunker down to let the fish come into camera range and I frequently get annoyed when a school of other divers decends upon me flailing the water and blowing bubbles as all the fish were hanging out where I was at.
BUT the question you need to ask yourelf is whether you have the required levels of experience, skill and equipment redundnacy needed to safely dive solo in a particular location safely. Asking and answering that question honestly is itself also to a large degree a product of a fair amunt of experience to at least be familiar with what you need to be familiar with in order to answer the question intelligently.
A solo diving course or at least a careful read of a dedicated text on solo diving would be a good start, and probably more productive than the argument that normally develops on the subject outside the solo diving forum.
Looking at your profile, you have better than newby certifications and experience in low vis/freshwater diving, currents, night, depths to about 100' etc. so you are not out of line asking the question.
As a general rule, before diving solo you need to be fully competent with navigation, bouyancy control and any other skill that may apply to a specific site as you are your only backup.
With regard to air, you either want an adequate and fully redudant air source (the minimum capacity required increasing with depth, and with a spare air never being considered to be enough) or you want to limit your self to diving in completely tangle free environments at depths no more than twice as deep as the depth to which you can freedive and limit yourself to profiles well within the no decompression limits.
As solo diving goes I tend to be a little extreme as I will dive solo to 150'. But I only do so with a fully redudant set of doubles as well as separate deco gas and only do so in locations and situations which are well within both my lifetime and recent experience and capabilities.
A careful and honest evaluation of your personal experience, training, currency, equipment and skill level as well as your knowledge and assessment of the local condition and risk factors that particular day is far more important than any fixed criteria in determining your solo divign suitability or limits on a given day in a given location.
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