I make ones like the last pictures in this link and they work. https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92626#Post92626

Now once they are hatched, having the correct food in the pond is critical. You want visibility from a phytoplankton bloom (NOT clay turbidity) to be 18:-24" or so. Maybe as low as 12" but that's pushing it.


www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).