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As long as he seems healthy, and eats good now, I wouldn't worry too much. I don't know of any "supplement" or the like that can promote rapid growth, and would really advise against it to be honest. Try to resist the impulse to overfeed. There seems to be some evidence that too rapid of growth, with diamonds in particular, can cause health issues.
Feeding him weekly sounds reasonable to me. Just keep that up, and he will grow. If it were me, I would offer as much as he will eat (within reason) at one sitting weekly for now. Then maybe scale that back to longer durations between feedings at some later point.
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