I have to say currently my taricha grans are the most hardy eaters of any caudates I've ever had. They literally seem to eat anything, and as soon as one piece of food hits the water all 4 of them are rushing to the scene. In fact, a lot of the time, they'll grab the nearest newt and start an amplexus when food is there because they get so excited. I've seen the 4 of them in a "newt ball" if I feed them their favorites like waxworms or nightcrawler bits. However, they've never injured each other.
I have had difficulty in the past with feeding them though. When I first got 2 of my newer ones and they were in quarantine, one of them was the pickiest eater and I thought for sure it wasn't going to live. I think about a month and a half went by and I only got it to eat one tiny cricket and a couple waxworms. The weird thing was that I decided after about 3 months that although it rarely ate that it appeared healthy otherwise, so I took a chance and tried it in the full tank with the others. Within 5 minutes it was eating worm bits with the the others. I have no idea why the sudden change to this day. Now that shy newt is probably my boldest newt, coming out of the water and attempting to bite my fingers, knowing that I am bringing the food...
But I am not advising to rush that newt out of quarantine. Like I said, I took 3 months, and even then sometimes you don't know that its safe.
Oh, and about locating food, especially faster moving prey, tarichas can be very clumsy and sometimes all the cheering them on in the world won't help them catch a piece of food. Thats why I'll hand feed them a lot of the time.
Just thought I would share because I've noticed that the same newt can have a totally different personality or attitude about food from time to time.