The other day I saw a video about making moss trees (something I've never really wanted to do in my tank but they do look cool). The way the guy bulked up the 'tree' top with foam before gluing on moss to get an instant visual effect gave me this idea.
There's a spot where the log in my tenner has a little elbow ledge that sticks out at the base. I wanted to grow some subwassertang there, but don't have a stone that will fit nicely in the narrow spot. Tried before and it just fell off. Don't want to tie the subwasser on, because it would be nice to lift it out for trimming.