I went "rock" shopping for the Assassin tank and came home with these two pictured. They are actually reptile feeding rocks. I use a large one in my snail tank and they help to keep the snail jello from ending up in the gravel. I'm hoping to add the Assassins in about 2 weeks.
Good idea! Tank is looking really good Holly! I need one of those for my snail tank. Right now i'm using a piece of slate to keep the jello out of the rock.
They work great and they look natural too. They tend to be somewhat rough so they are great for harboring beneficial bacteria as well. I thought it looked more natural than the clay saucer. Look for them in the reptile section of the pet store or any online store.