Any bright ideas on hiding crushed coral?

[B1gJ4k3]

I have pretty soft, acidic water and I've been using crushed coral in my tanks to buffer my PH for livebearers. I currently have it in mesh bags in my HOBs, but I'm thinking of only using sponge filters in the new 75g I'll be setting up soon. I don't like the look of the coral as a substrate (my gravel is black) and I obviously don't want to be looking at a mesh bag all the time, so does anybody have any creative ideas of how I can hide the crushed coral while maintaining the dark look of my gravel and other stones?

[keddre]

First, I have not tested this. Second, can you massage it gently into the gravel? 

[B1gJ4k3]

I could, but no matter what I do, I'll still be left with little white chunks in my otherwise black substrate, especially if I get anything that will sift through (planning on some panda corydoras)

[Alexa]

You could put crushed coral inside a terracotta pot (I’ve seen them come in black at my hardware store but you could also use aquarium safe paint) and then planting something in it?

Edit: Missed the part about corydoras. But that could be solved by putting a top layer of your black substrate maybe.

Edited May 12, 2021 by Alexa