The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
I do! Just noticed your post now it looks to me like trails of hardened vermetid snail slime. Did you just purchase your rocks? Can you perhaps give me a brief history of your tank, like startup date and what's been going on? Just a bit of information could solidify my current ID.