IMHumO, this is the smoking gun. IME no predator can survive long term on non-fortified frozen food, from 1 year to 5 years at most it seems.
If your baby tig takes any pellet, it's good. The better the pellet quality, the better off the fish will be long term. The majority of this pellet seems to be terrestrial carbohydrates. I don't believe a tig can reach its full potential on pellets, but then I killed all the tigs I had had.