I have build my self a CO2 injector today(only cost a fiver ) before I start it off I have a question.....My water is hard with a PH of 7.8, what affects will it have on the water and fish(Angels, Clown Loaches, Serpae Tetras, Redeye Tetra, Neon Tetras, a Dwarf Gouramie & a Kissing Gouramie)