- Location
- Queens, NY
A single fucntjional layer of crushed coral, so that amphipods can hide out when they get flushed form the refugium. I hate sand cause when I had the old tank with sand, everytime I wiped the glass with my magnet, sand gets in there and scratches the glass really easily. After a while I couldn't clean the glass about 2 inches above the sand level. Now, I have no problems wiping the glass.