How to really know if fish are getting right amount of food?

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Got a 150 with a spotted puffer (6"), porcupine puffer (7"), queen angel (6"), and banana wrasse. I try to follow the "2 minute" rule (feed what they'll eat in 2 minutes), but these guys will eat indefinitely. I don't want them to go hungry, but then I don't want unnecessary waste in my tank, either. I seem to err on the side of overfeeding, but I know that's not good. I'd hate to think they are hungry all the time, though. How do you really know if they are getting the right amount of food?
 
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