Well I will say that USUALLY there are no symptoms, but if they have had worms for a long time they can start getting dehydrated, lose their appetite, get some diahrreah(sp?).
If you are questioning, I'd get them to the vet. If you have a regular vet, for your other animals, you can most likely just collect a fecal sample from the cage and take it to him/her and have them run a fecal....any vet can do that,(but I'd call to make sure) but if the results are positive I'm not sure if your regular vet will prescribe medicine since it goes by weight.... most vets would want to check them out, weigh them ect. and your regular vet probably won't opt to do that for you.