towards the twilight days of my 104.72g lagoon I did end up putting sand in it (even though it was BB for most of its short life), and had major bare spots where the sand was cleared out from the powerhead. What I noticed that the bare spots where pretty static due to the flow out of the powerhead and around rocks. Keep in mind this was with a tunze 6105 and not a vortech. At any rate, what I ended up doing was just dumping in larger grained sand that would not easily get blown by the powerhead in the spots that the powerhead cleared off. That actually worked out quite well. For most of the tank I was able to use the fine grain that I like and in a few patches I had the heavier larger grains/crushed coral.
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