No, it is not possible. Tomonts hatch and either find a fish host or die. They cannot continue their life cycle otherwise, and they cannot "re-encyst." Thus, the clock need not reset every time a new (non-fish) thing is added to that QT. However, many do reset the clock, or add everything at once, out of an abundance of caution. Since, technically you could remove a coral and bring with it free swimmers that hatched from something you added later. Some just rinse it thoroughly before adding to DT. Others avoid this possibility and reset the clock. Hope that helps. And welcome to R2R!