FOWLR wanting to add substrate
 

When I re-established my 165gal a few years ago, I went with live rock without any type of substrate. I'm wanting to go back to live sand.

I would like to know if its ok to add sand to an established tank with fish already in it.

Thanks.

You might need to get your rocks, fish, and substrate out if you want to attempt this. This is just what I think, but I don't know.

You might need to get your rocks and fish out if you want to attempt this. This is just what I think, but I don't know. It might be possible.

You’ll be fine. Just run some water over the sand to get rid of the dust and small particles. And turn off your pumps for a bit.
I’ve done this a few times with no ill effects.

That is good to know!! I have always rinsed my live sand, but are you not also ridding it of the beneficial bacteria?

Thanks for the info!

If your adding "live sand" just slowly sink the bag to the bottom of the tank and then cut bag open with a razor and slowly empty. If using dry sand rinse well before adding to the tank as Eric said.