I had one rbta & one gbta, fed them a piece of fresh shrimp, scallops or fresh fish everyday. After 2-3 weeks they slit, now I have 4 & dont want anymore. I love them, but dont want a tank full of nems. lol!
I now feed them 1/4 of a silverside once a week. 3 are growing & looking really happy, but one rbta doesnt seem very happy w/ this as of late. Some of his tentacles are smaller then the others & more spaced out that the others, which means (I think), he is not getting enough to eat.
Just like us humans, some require more food than others:mixed:.
I will start giving them 1/2 silverside (in 2 chunks) once a week.
If yours is happy, not roaming & growing w/o a split them maybe ur doing the right thing for him, although they will grow a lot faster w/ more feedings, if thats what u want.
There is a "rule of thumb" in this hobby, but it is amazing that all these creatures are not "excally" the same. Different things work for different people

.
This hobby is defintley an adventure!
Your nem will let u know when he is unhappy.
Best of luck!