They are as heavy as you might think, and just getting them on a boat and into the water would have been a huge pain in the ass! Fortunate to have the pond freeze this winter.

Lol, no cinder blocks. It won't matter how they land on the bottom, it's a done deal as I'm not touching them again.

No clue if cats will spawn in them. My only hope is that they attract big bass and crappie, channels aren't a goal for me. Might be a consequence though.

Those piles of water main sound like a lot! Did you add any vertical cover with them? I'm planning on cedar and hedge being sunk on top of and around the tubes.