I have had many cases where freeze-dried were offered and the turtle refused anything else. Frozen has a lot of water and a little nutrition mixed in.
There is protein in the high quality pellets, and in proper amounts. I used live foods for a long time and had repeated problems with too much protein causing pyramiding. If you really want to feed some live foods, you should grow them yourself and use them as an occassional treat (grow some platies). Or you can use low risk foods like the worms and crickets mentioned. However, this is not necessary by any means and you might as well fill their stomachs with something more nutritious.
If he hit 5" in one year that is about the fastest growing turtle I have heard of. A pic would be needed to determine whether pyramiding has developed. Very fast growth like that can also cause problems like softshell, when the shell is growing so fast it can't be hardened enough. That situation can be caused by too much protein, as is the pyramiding.
Aggression can be a problem if he wants to keep fish with the turtle, or if the turtle ends up with other turtles. He may be alone now, but that doesn't mean he will be in five years when life happens and the turtle isn't in the same situation anymore.
As said, if he is 5" now, he should be out of that fast growth period of the first year or so that gets them from a very edible hatchling size, to a 3-5" or so that cuts down on the number of potential predators. He will be growing for quite a while still. If he will take the vegetation, give him some. If not, just try from time to time. Most will start taking veggies between 3-6". They are still growing, but the rate is not as fast.
There is protein in the high quality pellets, and in proper amounts. I used live foods for a long time and had repeated problems with too much protein causing pyramiding. If you really want to feed some live foods, you should grow them yourself and use them as an occassional treat (grow some platies). Or you can use low risk foods like the worms and crickets mentioned. However, this is not necessary by any means and you might as well fill their stomachs with something more nutritious.
If he hit 5" in one year that is about the fastest growing turtle I have heard of. A pic would be needed to determine whether pyramiding has developed. Very fast growth like that can also cause problems like softshell, when the shell is growing so fast it can't be hardened enough. That situation can be caused by too much protein, as is the pyramiding.
Aggression can be a problem if he wants to keep fish with the turtle, or if the turtle ends up with other turtles. He may be alone now, but that doesn't mean he will be in five years when life happens and the turtle isn't in the same situation anymore.
As said, if he is 5" now, he should be out of that fast growth period of the first year or so that gets them from a very edible hatchling size, to a 3-5" or so that cuts down on the number of potential predators. He will be growing for quite a while still. If he will take the vegetation, give him some. If not, just try from time to time. Most will start taking veggies between 3-6". They are still growing, but the rate is not as fast.