Hi AT, Alvy,
Thanks for valuable feedback. I will drop this idea.
2 months back, I had a burning powerhead in my tank which crushed my setup because of a cheapo you-know-where made. I lost a lot of mushrooms, livestock and the more painful task was to recondition my tank back to normal and it took me almost 2 months..... changing water weekly, changing filter media, etc etc.
Lesson learn, not to stinch on powerheads or any electrical device.
Thought RIO should be good cos' it's branded but seems like the reviews were bad.
I was really keen to try the rotating thingy. Anyone wants to sell ???
LimPC