Can I add sand cap to miracle mud?

[KVYA]

I'm setting up a 25g reef with two HOB refugiums and I was wondering if you are able to add a sand cap on top of miracle mud.

If so, how deep should the sand cap be and what particle size should I use?

 

[CastAway]

Pretty common I think, at least it used to be.
Is the purpose to keep the mud from getting blown around?

 

[KVYA]

Pretty common I think, at least it used to be.
Is the purpose to keep the mud from getting blown around?[/QUOTE

Yes and no. I'm going to be putting the miracle mud in a HOB refugium and will have caulerpa prolifera in it. I don't want to take out the caulerpa and the miracle mud when I'm pulling the caulerpa out. So I want the sand cap so the roots will latch to the sand and not the miracle mud. I will probably be using a fine grain sand if I can use a sand cap on top of the MM

 

[CastAway]

Hmm. I get it. My Caulerpa Brachypus only roots to about 1/2". Hope this helps.

FWIW, I don't think there's going to be hardly any advection of water through the mud with a matted layer of sand on top of it. In other words, that matted later of Caulerpa roots might prevent you from getting the benefit of the mud into your system.

We'll see what the experts say....