I am wanting to know what kind of vegetation and nuts pacu fish eat? I have been reading up on them and?

This should help. I found it on the website listed below. From what I've read on several websites, your fish can eat pretty much anything. This is what the site stated:

"Remember that your Pacu is omnivorous (eats anything), so provide him with a varied diet. Many high quality processed fish foods are available on the market today, and most frozen fish foods are also appropriate. In the wild, most Pacu eat primarily vegetable matter, only opportunistically taking bites of fishes' fins or scavenging on an old carcass, so you are best off to try to duplicate this in the aquarium environment. As a supplement to your processed and frozen foods, offer the Pacu fresh green vegetables, such as sliced raw zucchini, spinach, and pieces of raw potato. There are also many processed plant-based foods that are excellent for your Pacu. Your fish should be able to consume all the food you offer within two minutes of feeding (the exception to this being fresh vegetables, which can be left for several hours before starting to decay). If there is food in the tank after this time has elapsed, it will contribute to poor water quality and make your Pacu more susceptible to disease. Though Pacu will take live foods, feeding live goldfish is always a bad idea. Feeder goldfish are not a very nutritious food, and they are a good way to spread disease to your beloved Pacu. You only need to feed your Pacu once a day. If you feed more than once a day you increase the waste your fish are producing and also increase the risk of over feeding, so it becomes more important that you are performing your weekly 10-15% water changes and all necessary filter maintenance. Providing a proper diet increases your Pacu's life expectancy and bolsters their immune system."

I have owned one for awhile, so I can give you some advice here. First make sure you have at least a 150 gallon aquarium with very thick glass. They are known as Tank Busters. For food I feed him raw zucchini, spinach, and small pieces of raw potato. You can also feed them small pieces of meat. I would highly suggest not feeding them any live fish like feeder goldfish, only because these contain low nutrients, and create a lot of waste. They are like candy for Pacu's and they may become to accustom to them and refuse everything else. They only need to be fed once a day, and you can judge how much your fish eats pretty easily. They will consume the amount they need in about 2 minutes. Anything left over should be removed with a net so it doesnt decay in the aquarium. I have included some of my favorite Pacu sites, enjoy.