Original sentence: Permethrin and Laxazol [which contains the active agent permethrin] are known to be highly effective against mite infestations, but should be used with caution and only in small quantities due to its highly toxic nature.They are every snake-keeper's nightmare and sometimes difficult to eliminate
Edited sentence: Permethrin and Laxazol [which contains the active agent permethrin] are known to be highly effective against mite infestations, but should be used with great caution and only in small quantities due to its highly toxic nature.There is more in mites than meets the eye, they are every snake-keeper's nightmare and sometimes very difficult to eliminate [due to their resistance to toxins used to elminate them]