I've only lost the one but it isn't too hard. Just have to keep the tank sealed well. I have saran wrap taped over every crack and hole except for the lid on the front which I keep a decent sized rock on top of. I think the thing about keeping one with rays is that you may need to have more access to the tank more often than you'd like to reseal the tank.Agreed, mine was dog tame and ate out of my hand every day, he was at 2ft in a year and then one day squeezed out of the smallest gap and died....was totally gutted ans will not have another as too many jump out, it doesn't seem fair to me.
