Back when you were first talking about placing those things I was thinking that's gonna be a complicated process, if them suckers weigh as much as I think they do, they will pretty much land on the bottom almost any way they damn please, and trying to position them will be tough, unless it was done before the water was in the area.
Did you think to tie a concrete block to em to make sure they sink?
I got several dump truck loads of heavy, C900 water main line in various sizes up to 16" dia, but most in the 12" range, cut into 4' lengths dumped into the pond in several places. and the channel cat seem to be spawning in the pond, Im assuming in those pipes, if one end landed in the mud with the other end open that would make a great spawn site for them.
| 
