"I can't moan about any of it. I had a great time in the goldfish bowl"

Robert Plant's quote is likely describing his time as the lead singer of the iconic rock band Led Zeppelin. During this time, he was thrust into the spotlight and experienced a level of fame and notoriety that couple of people ever do. He was living in a "goldfish bowl," implying that he was constantly in the public eye and his every relocation was inspected. Regardless of this, he had the ability to enjoy his time in the spotlight and review it fondly. He is saying that he can't complain about any of it, since he had a fun time in the goldfish bowl. This is a testimony to his strength and capability to make the most of a tight spot. He had the ability to take the pressure of fame and utilize it to his advantage, creating an effective profession and becoming one of the most renowned rock stars of all time.