Would be curious to see how aluminum would do long term sub aqua ?? I know it does not usually oxidize until taken out, but if you were dosing ferts, maybe this would "rot" the aluminum??
The reason for my concern is I had Fissidens on SS mesh in a tank W/ flourite & it just melted over a time!!.... Maybe it was the substrate??
I know plastic would be a safe bet, but you would not be able to do the "sculpting" W/ the plastic that you could do W/ the Aluminum.
The one thing about moss is that it is furry- so you will always loose some of the detail of the shape once it grows in. IME, once a rock is covered with moss- they all look the same. It may be more trouble than it is worth.
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