rescue plants

Hi I've a 58L (~16US gallon) tank. Tap PH 7.2 Tank PH 8.2 GH 12 KH 21 Water company says current mg/l of CaC03 in my water is 307 Temp 30.8 (treating ICH) Ammonia 0, Nitrite 0, Nitrate 5-10. Lights on 10-12hrs a day. 1 LED lighting system CLA60 Ciano (8W – 18VDC) Use Seachem Flourish Comp...