i was adviced to follow the natural habitat as close as possible.
accordding to some refference books, elegants need nutritence to do well.
and since we all skim our water so cleanly. not much nutrience is left in the water.
wat we can do is to stick the base of the elegant deep into the sandbed, so that once the coral open up, it can touch the sand.
Therefore, drawing nutrience from the sandbed.