That's usually the case with pet shops but I have been to a few who know what they're talking about but I suppose the main problem is they deal with so many animals that it's very hard to get care 100% on each species. If you look on the actual Exo Terra catalogue, it says that tank is suitable for juveniles and I mentioned is for adults. With the bigger one you'd have enough space to do a planted set up as well, which will help with humidity and save you on cleaning