Heather thanks for confirming and expanding on my original post.

Quote Originally Posted by Louis Charles Bruckner View Post
I see no reason not to.
In a normal aquarium I wouldn't because of a few reasons.

as soon as it is established in the tank it is darned hard to get rid of unless you
break down the entire system.

It will reproduce very quickly and will block out light to the rest of the plants below the surface.

Since this is not a aquarium the only problem could be a clog to your Fluval filter intake.