Coralline

[Reverend Reefer]

how do u guys scrape the coralline off the front of your display that grows below the sand level? or is this something only happening in my tank?

[mudskipper1]

happens to everyone, can't safely (scratching) with a magnetic cleaner, I always use a small handheld scraper to get it. Tom Aquatics has a cheap one that I use, little red plastic things:

http://www.tomaquarium.com/prod_details.php?cat=30&p=236

[GT3]

yea i got those, very common.

[jokim]

razor blade

[Palting]

I have them, too. I just leave those alone. But then again, I only have a 2" sandbed, so only an 1" shows above the plastic trim.

[RenoR1]

I have a plastic fish tank cleaning stick with a metal attachment that is fantastic for scraping algae down there. Check out Petco.