I would look for washed plaster sand or reject masonary sand vs. the river rocks. Round rocks ate a PITA to walk on and are constantly rolling underfoot. One twisted ankle and you will be redoing the beach area.....

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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).