Can you tell me what this is?

muddog

Reefing newb
Hello, I am new to salt water reef tanks. I set my tank up about 2 months ago. I have my live sand in and my live rock. All are doing well. My tank has fully cured and am ready to start putting in corals. About 3 wks ago I noticed a thing that appeared on my tank glass that is alive. I have searched to see if I could find out what it is but to no success. It is clear like a jelly fish, and whiteish in color. Looks like it is all mouth with a tail. It creeps accross the glass opening it's mouth up and eating something from the glass. The tail on this thing is Y shaped. When it is still it looks like a circle shape but when moving it is long and thin. But the mouth on this thing!!! It will open it the entire length of itself except for the tail, and scoop in word towards the center of itself. As I looked closer there are more than one in my tank. Some are as small as a pin head and 1 as large as an eraser on a pencil. They seem to be cleaners of some sort, but I have no idea what they are or if they could be harmful. They will leave the side of the tank and swim to the live rock and continue to feed from the rock. If anyone knows what this is or what it may be please let me know. I don't want to purchase my corals until I know it is safe to do so, and that this thing will not harm them. Thank You in advance.
 
Ok I posted 2 pictures not sure if they attach here or where but they are listed as Thing. Maybe they will help. Thank You
 
THING1.jpg


THING2.jpg


You were close, you got the pictures up but you just needed to cut & paste the BB code below the picture into your message to link it.

Code:
[-img]https://www.livingreefs.com/gallery/files/9/3/9/THING1.jpg[/img-]
[-img]https://www.livingreefs.com/gallery/files/9/3/9/THING2.jpg[/img-]
 
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