Twitching Discus

[Yassmeena]

I went to my LFS today and there was a big discus in a community tank twitching every couple of seconds. I wanted to so badly to buy a gorgeous golden ram that was in that tank, but decided that even if I quarantine it, it may bring pathogens back to my discus. Took a lot of self-constraint - let me tell ya. That ram was BEAUTIFUL!:p

Why was that discus twitching!