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There is another way without half killing it.

Less light, fairly dense fish load/feeding.
Very little KNO3 dosing.
Low light CO2 enriched tank.
This keeps a stable low level of N for the plant without killing it.
It's fairly pink/red in natrual waters in Australia, many plants are in natural systems, but the system provides very low but constant N sources for the plant.

A low level drip/dosing pump etc can come close to mimicing this. But you have to be careful with the rate also, too little kills the patient, too much does not give any effect.

Some can slow the NO3 uptake down by limiting PO4, (but not letting it drop to zero for more than a day or so).

I'd not bother and just get a real red plant that has intense colors without almost stunting it.

Regards,
Tom Bar
 
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