Recently, my betta has been attempting to swim up my filter's overflow spillway, wedging himself between the spillway and the filter tube. I had to put him back in the cup I bought him in because he has scraped the scales off of his back by doing this so much. Any ideas what could be causing him to do this?
Also, I feel that the filter is producing too much of a current for him. I've thought about attaching fishnet mesh to the spillways to break up the current a little, but I'm open to any other suggestions. Thanks.