No idea what your furry white things are. When I read you note I was thinking some kind of hydroid (there are a ton of species, big and small) but this is different from anything I have seen in pics or my tanks.
Ink looks fine in the pcs. There is a form of arm curling that is a bad sign. The normal spotting is with the octo staying at the top of the tank with the arms drooping down and spiraling in what we call a cork screw. End of arms curled in a doughnut is nothing to worry about. If you are hoping for a sex id from this what you want to look for is the third arm to the right (clockwise with your eyes positioned with the octopuses) to be curled at the tip most of the time and often carried curled up when the other arms are not. This would indicate a male. From size (without reference) I would expect you should be able to detect this in the next month but I have made the female call only to discover a month or more later that the octo has only then come into sexual maturity and the arm is well pronounced.
Ink looks fine in the pcs. There is a form of arm curling that is a bad sign. The normal spotting is with the octo staying at the top of the tank with the arms drooping down and spiraling in what we call a cork screw. End of arms curled in a doughnut is nothing to worry about. If you are hoping for a sex id from this what you want to look for is the third arm to the right (clockwise with your eyes positioned with the octopuses) to be curled at the tip most of the time and often carried curled up when the other arms are not. This would indicate a male. From size (without reference) I would expect you should be able to detect this in the next month but I have made the female call only to discover a month or more later that the octo has only then come into sexual maturity and the arm is well pronounced.