i had mine in high current, high light at first, and started to grow roots off of every branch in an attempt to get stable. the damn thing took off, i had to trim it after a month. the trimming i stuck in my shrimp tank, low light low current, and it is just getting super bushy. the stalk i had trimmed off grew two new branches to make a Y, i left it in my main tank and it is growing pretty quick. its not dense but it looks super cool.
both of my tanks are low tech.
oh bear since you mentioned them, i've got some dwarf hair grass that isn't doing to hot in either my shrimp tank or my main, would you maybe want it?