I've been growing a cloned Christmas Cactus now for a few months, and it has been doing quite well. I moved to university 4 days ago (from Swindon, England to Bristol, England) and today I notice that since yesterday the leaves have mostly changed colour! The leaves were quite light green and suddenly they have adopted a much darker green colour and the leaves appear waxier. Is there anything wrong with it, or is this natural (for instance preparing to flower)? It also isn't absorbing water as fast as it was a few weeks ago.
Here is a picture to highlight the colour difference between a new and old leaf.