How Much Substrate Should I Buy For A 75 Gallon Aquarium?

[julielynn47]

So black sand looks different than black gravel?  I have black gravel in my 55 and it looks black.  Hmmm   that is something to consider before I put so much money into it.

 

[Byron]

So black sand looks different than black gravel?  I have black gravel in my 55 and it looks black.  Hmmm   that is something to consider before I put so much money into it.

 
It could be your light, as different from mine.

 

[WesleytheBetta]

As far as how deep you want your substrate for rooting, I agree that 2" or even less is sufficient for anchoring plants.  With that depth it will also capture plenty of waste to fertilize your greens.  

 Aesthetically I prefer less substrate as well.  
 

It depends on what you are wanting to accomplish and what you are keeping in the tank. I used only 20 pounds in my 75 gallon reef. I wanted it shallow. I had 300 pounds in my 210 gallon. But, I have 10 pounds in my 14 gallon. Each has a different set of livestock and care. 

Agreed!