Man, I am so dang glad I asked this. I would have mucked up. Below is my former nano (sad days she crashed last weekend) I could never get the GSP to grow the bottom 1/3rd. Now I know why. I was about to attach it to the top, lol. Thank you thank you thank you.I have to say I don't know. I have no plans to remove mine untill I take the tank down. I only glued a small 1-2" piece and now I have to trim it back from tye weir every 2-3 weeks. If you do add it place it as low as you want it because it will grow towards the lights and not downward.
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There was 1,000 watts of halide and power compact lighting on that 90 gal though 