Hi everyone, I'm fairly new here to this forum and after reading up a bunch I've found that this site has been the most helpful so far for me in the hobby. So a few months ago, I had purchased a flagtail from my lfs (I'm unsure on what species it is) and for the first month, he was quite active and personable as ever. Now recently over the last week, I've noticed he spends a lot of his time sulking in the corner of the tank in my jungle Val, just staring at the corner. Anyone have any idea as to why he is doing this? Any thoughts on the matter would be appreciated.