I was able to grow a partial moss wall, however, it was not international. I had a mixture of java and flame moss in my tank and occasionally some small pieces would cling to the back wall. I never cleaned the back wall so maybe it provided a texture that the moss could adhere to. Anyhow, ideal conditions allowed for moss to cover about 30% of the back wall. However, it was clumpy and irregular and was getting into the filter intake and stem plants. After growing steadily for 14 months, I removed it in about 10 seconds because it was getting invasive (growing away from the wall). Yeah, I could have trimmed it but that would lead to fragments that could lead to growth in places I did not want it.
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