shark

Hey everyone! I just got a custom tank- 5x5x1.5 I really want a shark or ray, I dont have to worry about when the get bigger- my local aquarium will take it. I really want something that will move around. I will either have a small layer of sand or a bare bottom- its a frag tank. (Yes i know, a...

At school in Aquatic Science we are setting up 12 tanks for different projects. One of them is to study a cat shark egg from hatching in a 55 gallon........ I know, I know. My question is should we consider sand and rocks in there or just leave it bare bottom? When the study is over in a few...