The AWM is in my Spec V. I also purchased Asin Water Moss which is a much smaller floater, with the roots growing an inch. It has easily tripled in a couple months. I have that In my small Spec. I have to take some out now and then as it will cover the surface.
BTW, twenty is a lot, as they are very big. I bought nine, and they mostly covered the surface of the Spec V. I have a wide two gallon with Blue Pearl Shrimp that is now covered with the babies. And I have small third generation babies in another container. If conditions are good the multiply fast!!
I should add that my DWL roots are 4 to 7 inches long. The original nine are the slightly shorter as it seems with time they self prune. The second generation are all on the larger end or getting there.