Check him at +2 to see what direction he's headed. If he's ~20% lower than the preshot number, you might expect an active cycle. If he's flat, then you might expect a normal Lantus cycle with some downward momentum. If he's ~20% higher, then he might be going into a bounce.
I'm so happy to hear that he was looking and feeling better today! As they say here, our kitties are so much more than just blood glucose numbers--we always want to focus on how they are feeling and behaving.
231 is definitely not too low of a number to shoot. Before you know it, you're going to be shooting greens! Take a look at Jude's ss. We shoot a lot of greens. That's where you want Regs to be, and eventually you will get there.