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1) Does corkscrew val grow taller than 12 inches?
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I put 12-20 inches max in the profile since this is what the sources report. My plants are maybe 8-10 inches max, but then I have very soft water and I am quite certain this is affecting them.
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2) Does the crown (point where the roots meet the stem) on the corkscrew val need to be exposed? I read somewhere that if it is buried then the plant will rot.
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True. All plants generally do this, so plant the crown just slightly above the surface of the substrate. Sometimes a plant will pull itself down into the substrate; my crypts are always doing this.
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3) Is not enough flow bad? I got a sponge filter because the tetras like really calm water, but does this mean that I am going to end up with a lot of dead spots that lack nutrients for my plants?
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No. There are thermal currents, fish swimming, plus the filter to move the water around, and more than one might realize. After all, one can maintain good plant growth in tanks with no filter at all.
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4) How quickly does Amazon Frogbit send off runners? I am using this to dim the light in my tank so my tetras will not be stressed, but I only have 3 plants of it right now.
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This depends upon the plants and their cycle. I have noticed with this species that it regularly goes through growth spurts followed by a slow down that actually even causes the plants to die off. In the two years I have had this species this has happened twice, so I believe it is seasonal/cyclical. All plants need a period of vegetative rest. Swords go through spurts of new growth, inflorescences, leaves, whatever. Then they sit almost static for a couple months. If our plants flowered in our aquaria, I am sure we would see this relating to these periods. This week I have noticed several plant species in my tanks beginning to show increased activity. This relates to the seasons in South America, we are entering the end of the dry season for areas north of the Amazon [if I've got my directions accurate

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