Thanks for the replies and compliments!
In answer to some of the questions:
My tigers are surprisingly active during the daytime. Yes, I have to fluorescent light strips in the tank, but I do not turn them on often, or have a lighting schedule with them. In the room, there is a window on the left wall about 5 feet from the tank, and I leave the blinds about half open, so that the room has daylight, but never direct sunlight into the tank. I want it to be sort of like it would be on a forest floor. (There is a california newt tank just to the left of this one,and they have no problem with light)
I turn on the lights occasionally, and they dont seem to mind, especially if they are eating.
The variety of plants grow very well in the tank with daily spraying.(But I would NOT recommend Irish/Scottish Moss, as those plants all died within a couple weeks; they must need more light...)
The tank has stays fairly clean, and doesnt smell from the humidity. Behind the light strips is a 3 inch gap along the entire length that is covered with aluminum screening, and this seems to allow adequate ventilation.
And as for the tigers digging up the tank: I have an average depth of about 2.5 inches of topsoil/jungle mix. I know that this is not much for a burrowing species, but I was taking the chance that they would be happy with the caves and other hiding spots I made for them. They occasionally cover themselves with dirt, but I havent seen them dig up a plant, or dig big holes; I think they are happy under the caves. (by the way, under the dirt I have a couple inches of lava rock and other small rocks for any excess water.
All of them are fairly active, with the exception of one of eastern tigers, who is often times shy unless it is feeding time.
And as for the water feature: One of the eastern guys spends quite a lot of time in there, which I was suprised by. Often I will get home from work to see him sitting on a rock in the water section relaxing. He has also recently discovered the filter, and seems to like hanging out on it for some reason. One of the barred tigers goes in on occasion as well.
Interesting comment about the S.S. Salimandra by the way, Al. I have one in a woodland setup too, and he stays under hiding places until nighttime or feeding time usually.
And the final comment: I have also noticed HUGE differences in the head shapes/sizes of various tigers. From what I have seen, the eastern species has a smaller narrow pointed head, whereas the barred species have large broad heads with relatively small eyes. I was wondering if these characteristics were a reason to separate them into different species. The barred tigers I have are male for sure, and I am not sure of the other 2, so that may be a factor.
thank you!