This option is definitely safer for your aro and probably cheaper or more cost effective in the long run than digging a pond. Aside from digging, framing, and lining a pond, you might have to take out the sprinkler system in that area and also hope that the hole that you dig doesn't mess up any plumbing, gas pipes, or foundation to the house. Most importantly, with the fiberglass tank you can drain and move it anywhere you want in less than an hour (another part of the yard, into the garage, or even inside your house/room). Also, should you decide to take down the fiberglass pond, you can resell it and recoup a majority of your investment (nobody wants to buy rotted wood and used pond liner from a decommissioned pond). I personally like the fiberglass pond because it has a window on it so that I can also enjoy looking at my fish from the side instead of being limited to only a top view from a below ground pond. Here is a pic of my friend's setup in his garage.
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