Yup, many of them are- there is a range within the grouping.
I know you are super busy and I'm not in a hurry, but if possible, could you post up the water parameters for your tigers? The last ones I got from you were simply awesome but they didn't do well for me. I want to try them again but I want to make sure my water is as close to your water as possible so they might do better this time around. Also, what substrate are you using and are you using RO water and remineralizing? Any tips you can give for keeping these guys would be awesome. Thanks!