My new office aquarium is now set up and running (no plants yet, just an empty tank): 44g Tall Office Tank
The GH and KH are both 5° (I'm just using tap water treated with API Stress Coat + to knock the chlorine out). I know the recommended hardness for planted tanks is <3°, but my question is (generally speaking) how bad is 5° and is it worth lowering it? I don't have an RO system, so I suppose that would be one option, or I could use bottled distilled water from the supermarket (and mix either of those about 50/50 with the tap water, which should get me to ~2.5° hardness). The pH of the tap water is 7.2.
My CO2 system is easily (with an empty tank) getting the pH down to 6.6 which is what I'm regulating it to at present, which by my maths gives me a CO2 concentration of ~30mg/l, which is about what I'm shooting for initially.
So, my question is, is it worth mixing in either RO or distilled water to get the hardness down to <3°, or is 5° good enough, at least for now?