Ive seen Tiled bottoms too, they can look better than bare bottom. A nice slate tile would look natural with a few slate rocks in various places around the tank .
“We didn’t underestimate them. They were just a lot better than we thought.” -Bobby Robson
“Football is a simple game; 22 men chase a ball for 90 minutes and at the end, the Germans win.” -Gary Linekar
"Some people are on the pitch! They think it's all over! It is now, it's four!" -Kenneth Wolstenholme