So I have had a few tanks In the past 6 years. So I had a velvet outbreak in my tank and in short I'm going fawl to remove it. Well obviously getting fish out of tank with all the live rock is a daunting task. So short story the bottom side of my rock that was on the substrate i noticed a purple and black speckled creature going into the a hole of a rock. I was inspecting the rock to make sure I didn't have any zoas on it and wanted to get it back in the correct spot. So I saw it and really didn't know what it was so I watched it closely. It looked like a slug of some sort. And it was definently living cause it ended up crawling deep into the rock after I brought it to the surface of the water near my light to try to see what it was. I tried to get a video but it is pretty blurry. I know its far fetched that someone may know what it is with my horrible description but hoping I may get lucky

