I hand feed them too. I make sure that only one eats at a time. The other one isn't eating as much as he used to either. I use filtered water, could that be a problem? And the crickets I feed them have a healthy diet and get vitamins etc in their food. The terrarium is all water on the bottom but I have some large rocks on one side that they can climb up on - they rarely do though. I clean the terarrium once a week - is that too much, too little? They have been so healthy and have eaten heartily until recently, that's why I never changed anything about the terarrium or their food. Thanks so much for all y'alls advice.