Hi there, my local PetCo has some rock nems that look cool. I’ve had some bad experiences with petco...fish not making it and some of their livestock look sick. Would the nems be something I should avoid since we really can’t treat them for anything? I don’t have a QT tank where I could keep them right now. I thought about buying a couple and then just doing a couple water changes in their container before transferring over to my DT. Any thought or advice? Would I be a fool to purchase?