Wow! Water changes helped huh? That's great. I have 3 small colonies (if I can even call them that. One with 3 heads, another with 3 heads plus a new baby one, and the third with 6 heads. The one with only 3 heads I purchased first and with in weeks of putting it in my tank they all were stretched up maybe a little more than an inch. And never multiplied. Months later I purchased the other 2, they seem to be happier and open up tightly against the rock which they are glued to. Have had them for only about a month, and like I said one has already popped out a new baby head. Why are the first 3 still stretched up. They all are pretty temperamental, and sometimes opens up more or less than other times but for the most part they all open up regularly. Any advice or suggestions?