Freshwater limpets are not that bad. I've never had them last very long in a tank with fish, and they never get to the overpopulation stage in a fishless tank. They eat some of the algae that grow on glass. They earn their keep, so to speak.
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".