Hi, I've only just got my tank running properly in the last few weeks, plants in, now have fish and this week was my second time of adding TPN+. I added it yesterday, Saturday, and without thinking. Today I've just done a 20% water change and then cleaned the external filters. The TPN+ will have mixed in the tank, but now I've got rid of 20% of the water. Would I be best to let it be till next week or should I think about adding a bit more TPN+ to compensate?