That is a very good question. Mine also grows into a ball shape. Seems to be growing away from light in a way. Some closeup time lapsed photos might show growth tips and answer your question.
Chaetomorpha grows 'throughout' the length of any given filament, but moreso at the ends.
(FWIW time-lapse photography would be of limited use unless you could isolate a single filament and dye it at regular intervals to distinguish between tip-growth and mid-length growth.)
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