Aponogeton bulbs are not a good way to start a tank. Crypts, stems, and swords are better. But nothing will grow well if it doesn't have enough light or CO2.
If you want a carpet, it's best to break up your patch of hairgrass and plant it in plugs throughout the tank. It will spread faster that way. And your bacopa will grow better if you plant the stems individually about 1" apart.
My fish change their own water... from clean to dirty.