Ya it's a dead spot issue. If you've ever taken a tank apart where the rock meets the sand is pretty funky and nasty. Detritus gets trapped there and breaks down etc. It also impedes flow across the sandbed for O2 exchange.
I used PVC support in mine.
Here's a link to that post. Several others I know have done it but I agree unless it's a big tank there is not a reason to make a huge effort out of it.
I used PVC support in mine.
Here's a link to that post. Several others I know have done it but I agree unless it's a big tank there is not a reason to make a huge effort out of it.