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Vallisneria problem

I have a problem growing vallisnera spiralis. The plants put out
runners, but the new plants never grow over 4 or 5 inches high. The
parent plants are over 2 feet high. What could be keeping the young
plants from reaching their normal height? The ph of the water is 7.0, 40
watts of full spectrum light over a 20 high, laterite in substrate,
occasional drops of liquid fertilizer per week. partial water changes.
If anyone has had similar problems, please help with any suggestions.