I used MTG for months and got nothing out of it, except for a greasy, dull, brittle tail.
I recently reverted to keeping the tail hosed with water 2-4 times a week, brushed when wet, and allowed to flow freely. I noticed a difference in doing just that.
Just yesterday I made my first application of all natural extra virgin coconut oil, and was pleased with the shiny, non-greasy suppleness it gave his tail. I'll continue with coconut oil for a couple months and see if I prefer it to just water.
I stay away from any heavy oils, silicon based shine sprays, and just most common tail sprays and conditioners in general.
Water is healthy and hydrating, and the coconut oil, I'm happy with so far. I'm still waiting to see what long term effects it has.
"You're just as sane as I am."~Luna Lovegood.