Join Date: Jul 2009
Location: Punta Cana, Dom. Rep.
KH and GH dropping (NPT)
I have a large 200 Gal set up with regular potting soil, lighting is 128W of T8 (+ good sunlight). No CO2.
My tap water comes out at KH 7, GH 12 and pH 7.
Tank water is KH 5, GH 8 and pH 8 (i tested both today and 1 week ago).
Seems like my tank is consuming hardness too fast. It's been running for only 3 weeks, and since i'm not supposed to make much WCs with an NPT, i'm thinking that after a few months w/o a water change i'll be left with no hardness at all.
What is going on?? is this tendency (to drop hardness) is common in newly set ups, or am i running into a problem?? Perhaps there is too much light/not enough CO2 making the plants (and algae!) deplete the carbonates and minerals in the water?
It's got lots of simple plants:
Ceratophyllum submersum, Anubias, Echinodorus ‘Rose’, Egeria densa, HC, Hydrocotyle verticillata, Hygrophila difformis, Bacopa caroliniana, Vallisneria americana and a couple unidentified plants that look like green Ludwigia....
Thanks in advance!