That's good to hear about what you discovered with the different temperatures for the hydropiper. I've been very happy with the way that it has grown in my tank. I enjoy keeping it a lot more than the HC I used to grow. I like the pace at which this plant grows too. and so far so good with keeping the belem at bay when it creeps into the hydropiper field. I actually spread some ADA powder on top after I planted the hydropiper initially. I felt like it did make a difference keeping it in place. I'm also fortunate that the tank doesn't have any inhabitants that would uproot it. the hydropiper and belem are keeping me happy.
The only way we really learn is to falsify hypothesis and which means dispelling myths that the speculators of the Aquarium world seem to rampant with
But if you cannot grow it to begin with, then you cannot say much
If you can, then you compare notes and observations.
I made the cooler temp assumptions, I even designed my 70 Gallon Buce tank to have it as a main carpet at one point for 70-72F. But....a small piece started growing in my 180 which is warm for the cardinals and plecos 82~84F and it was right next to the hot lighting. When the light is on, it's well over 87F in the moss top layer.
I would not have ever tried or tested this a priori.
I was just happy it grew and I did not have to buy more from somewhere overseas and have 95% dead when I got it.
I noticed the newer larger grain ADA AS did not root nearly as well as the older stuff with finer silt. The good current seems to correlate well in the 120 Gallon locations and the 180 which is up near the Vortech powerhead.
UG also behaves this same way.
I honestly thought it was a light demanding plant and would die and rot away little by little if shaded also.
So I buy into the myths myself, but I also know if I falsify a myth about a plant, I'm on that like a tick on a dog. then I'm not guessing/going along with the dogma/myths etc any more, I have some information that I know
Thus I can really argue without fear of being wrong at about the issues I falsify.
It's welcomed news for a nice little plant that's been troublesome for many, myself included. I can grow the snot out of it, the next question is the plant suitable for gardening and scaping? I have to say yes now.
HC and belem make a nice mix also, the grass keeps the HC and similar plants from getting disturbed or uprooted. I was going to do this at one point, I still may.
Folks should read the comments here about growing it, before buying it.
Once there's enough folks selling it, then a few plant killers are okay