Hi, my Sailfin has a place in Tang section of aquarium. She marks her territory by pushing substrate around like a dog marking his territory. Always do magnifying body check of ALL fish daily so it’s not flashing or rubbing. I make her mad as I move some rocks around to make transfer to 125l. My snails are big and unfortunately one has invaded her space, he’s “fallen” 2 x’s today and just caught her hovering and circling. Has anybody noticed this behavior?