krichardson;4868998; said:
Interesting but what if we filled a plastic bag with enough water to fill that tank and weighed it and the bricks separately. I think the bag of water would be heavier.
The bricks would be heavier than an identical volume of water for sure. I would think that those bricks would put a much higher amount of pressure on that section of glass than a full tank of water spread out evenly, not to mention the pressure points the uneven surface of the bricks could cause as CLDarnell stated.
It should work fine, but there are much better options. Something to take into account is that unless you have a massive amount of water movement in that tank, you are going to get a lot of nasty stuff caught between those bricks that will make your water quality worse, and it will be very unpleasant to clean.
Oh and with a heat lamp and UV over those bricks and some water splashing on them, every inch of them will be green in about a week.