Fish

Had as lovely day out with friends today.

Stopped off at a place that sold everything fish, from tanks to food to gravel to ornaments to well everything really! But how do you know if it's a good place to buy from?
The tropical section smelt damp and stale, there was no greenery or fancy ornaments in their tanks and I even noticed a little lost sole sunk at the bottom
The fresh water fish looked better but now I am confused as to whether this is a good place or not?