The Great Substrate Debate

[DenverBiocube16]

So, when I got my current 16gal nano I bought it from a friend who was increasing tank size. Everything looked pretty good, but the sand is less than spectacular. The sand is continuing to look worse and I’m wondering how everybody feels about changing out sand. I know it’s a huge pain and if I go with replacing it I’m going to need to do it in small patches, but I’d love some advice/thoughts/or insight into this task. Thanks all!

[Clown79]

I've changed out sand completely in 1 day, used all new after transfers, taken out part of sand and added new.

 

I didn't have any issues.