Fish Tank Plug (National geographic Half moon aquarium)

thingiverse

This ingenious plug is designed specifically to block the gap in my National Geographic aquarium, and I'm confident it's the 1.2 gallon model I've been searching for. My curious toddler son had a peculiar idea that the fish was craving grapes, so I quickly printed this makeshift plug to put an end to the experiment. Now that the temptation is gone with the aid of this plug, we'll see if my little one will leave the fish alone. To ensure it stays firmly in place, I'm considering adding threads to make it nearly impossible to remove.