yes the sand around the bottom must not irritate the polyps or they will receed and die slowly . keep them up off the sand a bit and try to do your own experiment . put the same one high and then put it in the shade and you will find that they are twice as fluffy in the shade . it will not slow the growth if they are fed a couple of times a week . also about a half hour after they engulf the food it really helps to get some water movement on them for a few minutes to flush the defication off the polyps and you will see them grow faster . you can even use a turkey baster to lightly blow off the matieral at this time and it really helps out alot . give that a try and you will be delightfully suprised !
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