backgrounds

Hi! So I had one of those plant/leaf backgrounds for Calcifer's tank to make it look nicer, but I got bored of it and replaced the background with a postcard collage. This was about 2 weeks ago and I figured he'd be used to it by now but he still flares at it occasionally. Sometimes he just...

He's red and the rocks are black. The only downside is he flares at just about anything that I put back there. I'm thinking about moving his tank tonight. But here are the pictures; 1. 2. 3. 4. 5. I definitely would appreciate the feedback and advice! :-)