If s plant cell is placed in a hypertonic solution the plant cells lose water and hence the rigidity pressure by plasmolysis pressure decreases to the point where the protoplasm of the cells peel away from the cell wall and it leaves gps between the cell wall and membrane making the plant cell flaccid.
If you can, put in your old pass. Log in and change the pass. You have to hope they didn’t change it. Then put your number and emai.l. So if it does get hac.ked again in the future it will ask you to reset pass. So you reset it, and put the pass. If he changed your original password. Sorry but that account is no longer yours.
We need to know the dimensions of the tank