If you are taming these on gen 1, note that you can whack the red crystals in the volcano area to get element shards, which you can turn into element at a mission terminal at a 100:1 conversion.This process is infinitely more efficient with a mining drill.On gen 2, there is a certain stage where the space biome has asteroids where you can mine element and element shards.Once again, a mining drill will make it very efficient.
As of 3/28/20. Ferox will tame at the wrong level but once put in cryopod will correct to tamed level. A live 145 changed to 217 once in pod post tame. Also dododex is not accurate on x3 possibly x1. The same 145 took 20 element for full tame. At 5% per element.
These things are really easy to tame in genesis 2, the hardest part of taming is finding them. All you need to do is feed them element and hover above them just out of their attack range but not too high because they will in Agro on you and run away. Up if this helped:)