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Hi Ian, I have two Pandas in my tank, both are similar except for the following: one has a slightly bigger head, this one also has more black in the dorsal fin and its black bits are slightly darker. Both I would say are the same age as they were bought together and are both the same length.

Do you think I have a pair?

Sonia,

With C. panda there are no colour differences in the sexes. You need to look at the ventral fins and overall body size and shape. females are larger and deeper bodied.

Ian