Their toenails will catch on carpet...not a recommended walking surface, for sure. lol
They can be a nuisance when over-populated. Likely too many eggs carried along in the bedding. Leave extra shallow pans of water overnight - they don't understand the smooth surface and will drown quickly. That should help get them to a balance point.
Frequent soaks for the tort to get them off.
As crustaceans, they can manage a fair amount of water during the day, but for whatever reason they did not evolve an ability to swim out of water in the dark (can't see far enough? dunno. Unintellgently Designed lol).
Diluted essential oils will kill them, but torts have very sensitive noses. A last resort.
Torts are also susceptible to topical anti-parasiticides sold for other reptile species, so I would not buy something like that.
People often dump out substrate and replace it, but the cycle will begin all over again. If you an get them to a managable population, all the better.