Depends on your specific petco and its staff. Just like a show, there is a chance of transmitting disease and mites, and that's a risk you have to weigh if bringing in any of your own animals. We have brought in a large group of our animals before, but we were the only people there with animals, and everyone had to use hand sanitizer. Once home they got a preventative treatment for mites.

If you are satisfied with the practices and treatment of the animals there, risk is smaller than a petco where the staff are horrible or ignorant Even if the habitats are very well maintained, are you confident that the staff will convey correct information about your animals if asked?