Since we're moving into our first house in the next few weeks, I have an opportunity to make a few changes to the tank while it's being moved. One of which is to purchase a new 65g tank to replace the 46g bowfront we already have. I currently have ~60lbs of
Crushed Coral that will be transferred to the new tank, but what do I 'top up' the new tank with? Sand or more Crushed Coral? The current bed is ~3" deep and almost 4 years old. I don't want to replace the whole thing ($$$), but I do want to make use of the current inhabitants down there.
What do you think?