Well on day 7 the basic body morphology hasn't changed drastically. The mouth is proportionally a bit bigger and they are getting a bit larger. It seems that the internal gills/lungs are developing a deeper color.
They do seem to be a bit more agile in positioning themselves and while they don't have legs, they balance closer to their center of mass rather than just gliding and crashing to land where they fall.
The parts of the eye between the pupil and the body are getting larger but I don't see any evidence of muscle control here yet (closing the iris). The patterning of pigmented cells over the body is showing signs of order rather than randomness. The pigmented areas are still only a few cells large so I think it's a sign of differential expansion rather than migration.