I have 2 male dwrf Gs and they do just fine in my comm. tank. They're in a tank with mollys, SAEs, cory, platy, sword, neons, shrimp and otos.
They were kinda shy the first month or 2 but are now right up in the middle of the feeding frenzy. They're brave enough to compete with the mollys for the shrimp pellets but usually just grab the loose pieces that float away.
They harass no other fish. They liked the floating plastic plant I had in there for the molly fry (there was a hollow they would hang out in) i have a hollow stump in there and a castle they like to hang out in too so places to hide are a good for them.
I love the way DG move through the water. It's cool to watch them feel things as they explore. I'm gonna get some more soon.
Q