Anyone ever have their stingrays chew the silicon along the joints of a tank? I built my first tank/pond and I didn't do the nicest job with the silicon. There are little pieces sticking up where I was smoothing it out and every now and then my motoro will be biting at them. Occasionally there is a little piece I find in my filter and you can even hear the silicon snapping when he pulls it. He doesn't eat it, just kinda plays with it it seems but I am worried he may eventually break a seal.