Thanks for the advice! Essentially, it wouldn't have done any good to quarantine these guys as the had been in the same tank for several weeks at the pet store. If they were going to share germs, it was already done! I started out with 3 in one 10-gal and 3 in another. I also may have overestimated their sizes. 1 1/2 inches may be what the largest is but the smallest one's body is probably closer to an inch. Cleaning the tank is certainly a good idea. I am hoping to move them to another slightly larger enclosure soon also. (I don't think they are anywhere near ready for the HUGE vivarium that will be their final home.) I just don't want to go too big, too soon as some of themare not very good hunters yet and might not be able to find the crickets. So far, all the others seem healthy. Time will tell!