When the Brichardi's get spawning its like every two weeks there is a new batch. Thats been the average up until I disturbed the tank, then I had a pause for 3 weeks before she got started again. In my opinion its to short of a time period, because it doesnt give me enough time to do a good water change before a new batch is born and the prior batch is big enough to get out of the way of the syphon.