Should be, if it gets enough light. I have it growing in several tubs in my basement, but it gets some diffuse sunlight and fluorescent light. I've had it for 2 years now and it's slowly spreading even into the water.
What I have is very skinny like, grass and only grows about 4-5 inches tall.
Is that what you have?
You want pics?
I keep taking pictures but most come out so bad that I'm reluctant to post them. Maybe I'll try and out something together though since there's interest.
Tubs are mostly un filtered/etc but I sometimes use little pumps to splash water and increase humidity. I've just started using airstones as well.
As for critters other than incidental blackworms and snails nothing else as the tubs can go down to 40-50 degrees and I worry about survival.
I do have some heated tanks with Malawa shrimp and if I ever get enough I might start trying them in tubs.
I have some growing outside. Planted in classic plant soil and kept moist with automatic irrigation system. Then, I had some cuts planted in outside "riparium" made from sand ; and it went growing new stems. Same with bits planted in an indoor riparium ; still only planted in "Sable de Loire".
The "indoor" testing installation can be seen here. You can see the equisitum ; that didn't fork yet at the time of the shot. Now that I know it works, I'm building a real support for planting on top of the tank.
During my duplication testings, some cuttings did survive, some didn't. There might be a size or a way of cutting the initial stem. But I haven't identified it yet But it seems to be working nearly every time.
Everybody knew it was impossible to achieve. Some idiot wasn't aware of it. And just did it.