I have a 5g tank housing two female and one male guppies. I got the two females first and they had fin rot, so I treated the 5g. Meanwhile, I got a male and had him in a quarantine tank, where he did just fine. The fin rot is now all cured up and I've done several water changes since ending the medication regimen, so I added the male to the tank. Right away, he started chasing after my females. "Success!" I thought. However, recently the male has only been devoting about half of his time to his romantic pursuits and spending the other half of his time swimming up and down the aquarium glass in one particular corner of the tank. Is there any particular reason for this behavior? Should I be worried? Is there anything I can do to get him to cut it out if it is stressing him?