Seems like a few others I have seen.
Only thing I see that MIGHT be of concern is the lack of drip plate, and the location of the outflow.
The reason I say it COULD be a problem, is the water could channel and flow all in one or two spots. Then because of how low the outflow is, the water could leave the the main biomedia dry, leaving you with only the lava rocks.
This is just my thought, but give it a try at worse you have just bought a new trash can for you to use at home.