Yesterday I fed my boy frozen bloodworms for the first time, which he viciously devoured. He has been happy with no problems up until now(other than a tiny bit of fin rot). But i woke up this morning to find that he had 1. built a bubble nest for the first time and 2. started tail biting

now Im all confused and frustrated, because i know his tank isnt very interesting but i have been planning on getting his tank planted NPT style but have been waiting for sweetaquatics.com to get their new shipment in so i can order what i want...ive been checking everyday for about 2 weeks with no luck.
i thought that tail biting was supposed to be stress bordom related, and bubble nest making means that hes content...and he did both at the same time so now im confused

Help...please?