Don’t take my word for this as this is just my own “theory” that seems to make sense in my mind. It may not make any actual sense.
I would leave the tank lid off, lower the filter intake tube close to the bottom of the tank, allow the water to evaporate from the tank and only do top ups. This should make the water level low signalling to the fish it’s dry season, it should also compound all the water parameters you would think will be higher in the dry season bc of the lack of incoming fresh water. Maybe try turning the water temperature up to signal to the fish it’s hot outside and the water is evaporating.
I’m not sure how long you could safely do this in a tank as we know the nitrates will also be building in the tank which isn’t good for the fish. I would think two weeks is doable in a reasonably stocked tank without causing too much harm. Though to be fair it’s probably not ideal.
I will admit I neglected one of my tanks for two weeks and allowed this to happen and when I did my water change it caused spawning immediately. I may even re-try it as I really want this species to produce fry for me
