I know what you mean, but my moss problem is caused by goldfish chewing away at the stuff. They don't swallow it but they sure love pulling it off the rocks. I had a hand sized patch of stringy moss growing but when I took my tank divider down, it was gone within a day. It is all over in the filter. I tried to salvage what I could but my efforts were futile.
I used staples to good effect with Java moss in my tropical tank. Otherwise I can't get it to stay. Too bad they will rust eventually, or it would be 100% safe.
Good to know about the rosy barbs.
My tank sucks now
Fraternity of Dirt # 22