Xenia or gsp.Then wait a year with out pruning.:LOL:
He's being silly because both GSP and Xenia can take off like wild in a tank that they are happy in. I've grown both and if you control their spread they can add a lot of texture and movement to a tank. Many people neglect this fact and when left un managed will run a tank over very much like Kudzoo does here in the south.
I would suggest getting away from Crushed Coral if you're planning to go REEF tank. It has a high probability to cause water parameter issues in the future.
Also a side note/warning about Sand Beds. Shallow is 2" or less and Deep is 4" plus. The area in between is routinely considered a No-No area. Of course you may have areas in a 4" sandbed that are less but you want the majority to be over 4". The reason being (and this is speaking in VERY general terms) is that 2" allows for
Aerobic bacteria pretty much through and through and is easy enough to keep the whole sand bed turned over preventing deep pocket areas of decay. 4"+ is deep enough to allow for
Anaerobic bacteria and allows for pockets of decay that go undisturbed. Between 2" and 4" you have areas of deep pockets of decay that could get disturbed (
not good for the tank) but the sand isn't deep enough to allow for Anaerobic bacteria. If you can't get over 4" then it's not worth the risk of having decay pockets that can get disturbed. That's just my 2 cents on sandbeds.