Hey I've seen alot oh tusks in stores with big white callous like spots and wanted to share my success recently. So I just ordered one from saltwaterfish.com and it came with a huge spot in the middle of the tail, little white spots all over his fins and a mild fin rot. I sent them pics and they never took responsibility, kept sending me "need more information".... stupid. Anyways I had some microbe lift herbtana that I used on my foxface when he had parasites(didn't work and died) and it's a 10 day display tank dose. I used it for 2 days and the huge spot is nearly gone, all the white spots are gone and his colors are popping. It definitely boosted his immune system and now I'm letting it do the rest of the work now.