Ive grown all kind of moss and riccia on clay with good success. As for the drainage issue with clay is that clay does not hold enough water to cause the broms to rot, like planting them in the viv soil at the base of the viv does. This is why most people use the broms in elevated place in the viv. Im going to be using another clay base in the new viv again and will be trying out planting ideas for larger broms in the base of the viv.
Michael





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