i dont have pics but it looks like a small zoo the size of a small button.when i go near it sucks itself up into rock.its brown in color.and like i said it looks exactly like a zoo.
I've only used white vinegar and it's always worked for me. I use a syringe with a needle. If you can take it out of the tank that would be best. Also, I only use 1.5ml of vinegar. Use half on the first shot ( right in the center)and give it a few seconds and hit it again. Try to take great care in not blasting anything around it.