I just changed over my 16 gallon Calvus/Comp growout tank to sand...Here are some pics. Also, what do I need to know about taking care of this? I am going to change over my 90 but with as long as this took I will need a whole day to do it. Any tips on the easiest way to do this? I can already tell I love it...The 16 used to be blah but just the change over made an awesome difference. I love the look of this tank now!!! Any new tanks will be set up wih sand from the start.