You can glue them to rocks or leave them on the sand bed, they dont seem to mind, I have them placed both ways in my tank and they are all doing good. If you want them to grow fast, feed them. I target feed mine 1x a week with either reef roids or frozen brine shrimp (yes, they eat brine shrimp) and they grow like crazy. I got a few in January that were all 3-5 heads, all are at least 7+ heads now and growing like crazy.
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