Thanks John. I'm going to link two or more together and add a block between them. I like the idea of an upside down tree. May be good use of the 4in pipeline. Expanding foam can go inside the pipe for added flotation.
Thoughts on groups, or line near dense cover and use of logs?
Eric (ewest) has the placement covered. I failed to put any highways between my structure islands. I found PBF after my structure was already placed and water was filling the pond. Providing means for smaller fish to travel around to different structures keeps them from being forced into open water where they are more subject to predation. Of course you want predators to eat your forage fish (so don't want too much cover), but you want the forage fish to reach enough size to provide a good meal. So they need enough cover to keep them alive to proper forage size. Plus attract the larger fish.
I would avoid cover placement anywhere there is large inflows of water as it will tend to get more sediment there.
