Thanks guys- I appreciate the comments
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I just came to post that it takes 3 days.
It takes 3 days for my hygro ceylon and my stargrass to go from a roughly 3-4" stem to about 8" tall, just under water level. This is ridiculous! I will hopefully be setting up my old digicam for a better picture this weekend, but we'll see. If I have the time, I would also very much like to fill out my neon school.