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Same here, moved around for the first week or two and stayed in a spot it liked. If you don't drastically change anything or the flow near them, they will most likely stay put. Mine always moved though again after splitting for a week or two then settled down again.

Mine in low flow areas always settle quite high in the tank for lots of light (I assume) and the higher flow areas, they will settled sooner (even if its lower with less light) to get a good grip and hold on. Maybe a coincidence, but mine seem to behave that way at least...