I just moved my betta into a new 5.5tank last night. It's a lot larger than his old tank, and he won't stop freaking out. At first I assume it was because of the filter so I removed it, but he continued to swim frantically, and his stress lines are still there. I want to put the filter back in, because frankly I don't think he really noticed it in the first place. Should I put it in now, or wait for him to get used to the home before introducing it?