It's a dead acro, yeah. Just a bit of decoration that came with the rock.
As far as the wave maker goes, I can't really comment on it too much at this stage. But the unit itself is very sturdy, the mount is easy to use and secure, it can be directed in a wide range of directions, the custom controller is very easy to use. The flow rate seems very strong in my opinion, like I said it blew a lot of c**p off my rock. I can see that there are strong currents all between the rockwork as well. Hopefully its positioning will mean that I have areas of high, moderate and flow flow in the tank. When it is on its high setting, I have about 48x turnover in the tank now.