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Whatever you do I would start out slowly and not make a lot of changes at once, especially since your tank is doing so well. There are two major dosing methods, EI (estimative index) and PPM (perpetual preservation system). I suggest you read about both but if you want to stick to 25% water changes then you will want to go the PPM route. This calculator should help you out as well - Rotala Butterfly | Planted Aquarium Nutrient Dosing Calculator
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