Replacing Gravel?

[Howard0]

How much should I change at a time? Should I be changing the gravel at all? It's been about 2-3 months.

 

[Ninjouzata]

You don't need to change it unless you want to or have fish that need a different substrate, though you should be cleaning it by vacuuming with a siphon.

 

[CSnyder00]

Yeah. No need to change it unless you or your fish want to!