Bluwc, yep, the 25 wide tank really pushes the limitis of the base slimline. i think the 80* optics will help. Maybe I can get some in and switch them out. We'll see.
Jim, the Slimline is dimable via setting with the remote control. I am not sure about the S model.
I have played with the S just a bit tonight and it is VERY bright and the spread is much wider. Even with the 60* optics, it covers this 25" wide tank without a problem. Given that it is pre-production, all the programming goodies are not included yet.