Anyway over the years the liners have settled and drooped/ sagged to the point where I have to keep the water level so low it just isn't satisfying anymore.  I drained it last Fall and plan to rebuild soon as the weather is starting to get nice again.  I want it deeper this time and plan to open up the two existing holes into one larger pond.  Forgive me for this but I simply hate the look of rubberized pond liners.  It's not even an option for me.  I am considering concrete but of course this would be a lot of work and expense.  Options?  Are there larger/ deeper versions of preformed ponds out there?  What about fiberglass.  I have experience working with it and while it may cost a bit more in the end it would be a lot easier on my back than working with concrete.  I have also thought about just getting a large pvc stock tank, like 8' dia X 30" deep, just not sure if I really want a perfectly round pond. 

I'm pretty much open to any ideas at this point.  TIA for your thoughts.

Seahorse Aquatics: yes, we have no seahorses.