I'm trying to build an aquarium with a daily tidal current. My aim is to have a low-cost, easy-to-find materials for the setup. Practically, I have two tanks, an aquarium and a water reservoir tank linked by a siphon. The aquarium is linked to an air pump, which pushes the water through the siphon in the reservoir.
My question is:
Is it possible to let the water flow from the reservoir into the aquarium without any water pump? The initial principle was to create depression in the aquarium so that the water is sucked in, but I've seen that if the air pump is still on when the tide is low, the air is escaping through the siphon so avoiding depression. Is is so possible to link some sort of valve to the siphon, or is there any other possibility?
Thank you for your help