Cons:
Scratches the glass
If you pile up a whole lot of them, you risk cracking the glass (I've seen it happen)
Hard to clean the glass behind the rocks, so it isn't as nice looking
More difficult to place powerheads behind the rock to eliminate dead spots.
Pros:
Easier aquascaping, and often more appealing to the eye.
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~ Mindy
SPS fanatic.
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