Marian, there's nothing in our program that would prevent a fish from swimming through an arch... I just didn't put any arches in. I haven't found the right one yet.
I did see, in a pet store, an arch made from three pieces of petrified wood... so maybe I'll try that kind of a setup.
Orca: Thanks!! I'm glad you're enjoying them! Feel free to suggest improvements also... (Or just stick with the praise; I won't mind!)
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