MTS only overpopulate if you overfeed the fish in the tank. And I have a varying schedule so my lights are not on at the exact same time each day. I can even get away with being gone a couple days and having the light left off. I would have MTS if I could find somewhere to buy them. It's just a lot less hassle to stir the sand.
They will also overpopulate if the plants are doing poorly and if theres an algae bloom.