Substrate that'll hold its shape?

Austrarhyncus

New member
I want to do a mangrove biotope, and I need a substrate that'll allow mudskippers to dig burrows. With regular sand, this wouldn't work, since it won't hold its shape, so what substrate could I use instead?
 
There's a guy on another forum who successfully replicated the mudskipper habitat and even bred them. The mud he used was "very glutinous and once set, forms a very sturdy surface and as such, very little maintenance of the slope is required". He got the mud from a mudflat. I could try to find a mudflat to get my own mud from, but I want to see if there's any more practical solutions.
 
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