Not sure but if your just using it as a buffer get a big bag of it and shove it in the filter. Same purpose but never touches the fish.
Caleb
Tank size?
I had a bag similar to that and used all the shell pieces. A couple pounds mixed with this offwhite substrate.
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From my experience Mbuna have mouths built like a pit bull doggy. They are smart ill tempered digging machines. Pitbulls are big softies. Some just have terrible owners. The CC will be fine with them. It will also help harden the water mixed in with sand.
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IMO, always incorporate natural hardening are softening agents into your scape depending on the fish you keep.
Yeah, mess around with mix ideas. Try some different grit sizes and colors. Mixem up in a small sample bowl with water before going all in.
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I like the look of crushed coral mix. It is ultimately up to what you're visualizing for the tank.
Looks like a darker gray playground sand? You could add a couple more types, like white pool filter sand to play off the CC weathering.
The substrate in the pic I posted is a "African cichlid mix" with additional CC.
You can see how 1 Mbuna can totally redecorate a 29g after a pwc.
They don't just use their mouths to move substrate, they'll do powerful tail whips to clear an area too.
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Also realize he was rehomed, but just for the record, I've grown out a rainbow shark with mbuna with no trouble. He is 5 inches now and has plenty bark to be with electric yellows and acei. He was maybe 2 inches when purchased. These guys are tough.