Thanks y'all! I'm glad to have them for sure. Sierra loves to hide! She gave me a heart attack. I thought she got out somehow a few days ago. I searched around the tank taking everything out and didn't see her anywhere, then the room and house for over an hour and my husband got home to help me look, he looked in the tank and saw this head pop up out of the aspen, he went to ask where her sister was and then saw the other one at the other end of the tank... Whew... We couldn't find her another day but I didn't panic so much this time, I knew she had to be in there somewhere. Come to find out there is a place in the log that they can hide that you cannot see from any angle unless you take a flashlight and look down in the hole, now I know where to look when she disappears. The lil rascal... Other than that they are settling in nicely.