I am not sure about Quick Cure, but I have personally used Kent's Marine RX-P (safe for FW too) and Kordon's Ich Attack (its supposedly all natural) in my 55g planted without any affect on the plants. The RX-P was most effective and got rid of the ich faster. If the Quick Cure seems to affect the plants in your tank, you could try to locate RX-P. It is a SW med, but it was recommended to me by someone that used it with Discus fry and I have had good luck using it in FW.
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