I'm a bit concerned about my new Julii cory that I got just yesterday. He's in a 10 gallon quarantine tank, and I'll be putting him in my big tank when his quarantine is over. He hasn't been very active since I brought him home. He cleaned the gravel a little bit yesterday, but this morning he seems to want to stay still most of the time. He's not looking sick in any way, just not the active little thing that my other cories have always been. Could it be he just needs adjustment? I know other types of fish sometimes take a while to adjust, but I've never had a cory that didn't immediately start to clean when I brought them home.