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My observation may help, although no directly applicable to goldfish:
I have had two Lobelia cardinalis which have become enormous in a 72 gallon
planted aquarium with a heavy tropical fish population. The plants were 18
inches tall, and the stems were 3/8 inch across. They were never bruised
while in the tank. The fish and the plants lived in perfect harmony, and I
could attributer no ill effects of the plants on the fish.