You didn't buy potting soil, you bought potting mix. I use potting mix to grow tomatoes and peppers in self watering containers on my deck. The manufacturer tells you to use the potting mix because real soil would compact and prevent the plants from rooting well in the boxes. I haven't tried using the mix in an aquarium, keep us posted with your results.
Aquascape? I'm a crypt farmer.
It's a fine line between fishing and standing on the shore looking like an idiot.
That IS an aquascape, it's titled "The Vacant Lot".