The longer you let the cement cure the harder it will get and the less likely it will leach in your tank.
If you want, you could place it in a bucket or barrel and change the water every few days untill it gets to a desireable Ph. I would avoid adding salts or acids to speed up the process as they can damage or weaken your background.
If you want, you could place it in a bucket or barrel and change the water every few days untill it gets to a desireable Ph. I would avoid adding salts or acids to speed up the process as they can damage or weaken your background.
