Just came across this thread and thought I'd throw in my experience with moss and mbuna. I have had no luck so far. Mbuna are algae grazers and, though they don't necessarily eat moss, delight in raking the fine leaves of the moss with their comb-like teeth in order to pull off any aufwuchs (microcrustaceans, rotifers, algae, etc) growing on it. This is very hard on the moss and tends to scatter it all over your tank and prevent it from growing where you want it to grow. I think that if you can manage to grow moss without any algae whatsoever on it you might be able to get away with it. I'm getting ready to try it again using Vesicularia ferriei (weeping moss). We'll see how it goes.
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