Those two are significantly larger I think, I had a gracillis which had a stem as thick as my little finger. Praetermissa has reddish stem even when the leaves are not red; and the leaves can get much redder than gracilis; blood red/rotala macrandra red. It also doesn't do as well in the aquarium as gracillis/crassicaulis.
With that pic, its hard to say atm. Once they get big enough, maybe itl be easier to tell apart. AG grows up to be monsters, but if kept very cramped and with little light, they will grow thin and leggy like in the pic.
Its more trouble than its worth... its the bunch in the center. The only advantage perhaps is that its smaller than other colored stems, so works well for small tanks.
Yah, it's not my first choice for red plants but I've had it and it grows for me so I'm not complaining. Plus it works well enough as a foreground in my 10 gallon.
I should try the others one day though, for my 75.
I bought the nesea as nesea red. I dunno if its a hybrid or what.
The ammannia grows really fast, like weed like fast. Its also forgiving in high tech setups. Ive had them under shade and neglected them and they still grew. Under low light they get greener and smaller.
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