The best way to prevent HLLE is to leave the fish in the ocean...
Its been researched a ton and there is no simple answers ..I had a PT years ago start to develop it and started adding vita-chem to food and it reversed and never showed up again..Others may have removed carbon ,while others added a grounding probe ..Some even think its from lack of natural sunlight ..
There is no cut and dried answers to the mystery of HLLE..
Just follow the advice of all the above ..