From what I understand about southern ponds, with that shallow of depth 6' 10" which may be actually 6' most of the time if it doesn't leak, you will need to fertilize or you will be fighting rooted weeds and filamentous algae about 8- 10 months per year. Other southern pondowners and our experts will be your best source of help after your pond fills with water.
A 6' deep pond in the north is a glorified wetlands covered with weeds all spring & summer long unless you have lots of grass carp and or lots of chemicals.
