I recently rehomed my betta fish from a 1 gal bowl to a 3.5 gal filtered tank as part of treatment for fin rot. He's doing great and I noticed a behavior that seemed odd to me. The betta seems to frequently hang out right by the intake tube thing for the filter. The filter isn't super strong, it doesn't seem to be hurting his fins, he has no issues with the current that I can see around feeding time, he just seems to like to hang out there. Is this normal or should I be concerned?