I know a lot of people are going to think I am stupid for thinking this. But I am thinking about changing out my sand. I have a very thin sand bed i my 29 gallon. I think it might be about 2" in the front and behind the back of the rocks there are spots with no sand at all. The sand is a little over a year old. The sand is nasty and dirty. I mean I have plenty of critters in it to keep it from messing up the tank, it just looks bad. I really want to get black sand. I just think it looks cooler and would make colors pop. Is it bad to just change the sand out? Is it going to be a long process? Should I do it now or wait the 6 months till I move then since I will have the tank torn down do it then? I know a lot of questions.