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Instead of measuring the length increase, which is a very poor measurement of growth, you should measure weight gain. Wet weight can be measured by swinging off or blotting off attached water. I have done that by putting the plant in the middle of about a three foot strip of cheese cloth, folding it back and swinging it around. You can start with a number of small plants, get their wet weights, or, better, their aggregate wet weight, growing them under the experimental or control conditions, and then getting their wet weights again.

Dry weights are even better measurements of growth than wet weights, but you can't get the dry weights of starter plants because then they are dead and you can't start them. You could get a large bunch of starter plants, divide them in half, get the wet weights of each half, plant one half and dry out the other half and then calculate the dry weight of the planted half by assuming that the fraction you multiply the the wet weight to get the dry weight would be the same in both halves.
 

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It looks like a lot of the plant died in the tank with added pharmaceuticals. The plants are definitely healthier in tank 2. I would subtract the dead growth from the orighnal lengths. The fact that the sprouts grew in tank 1 may be due to the pharmaceuticals being destroyed by bacteria after a while, and thus, the parts of the plant not originally killed were able to grow.
 
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