Just got my 1500gal pond up and running. Its been about 2 weeks and the waters getting murky (which i expected). When i test the water every things at 0 except the ph is at the very low point of my test kit so its around mid to high 6's i assume. Is this normal or should i do a water change or something to fix this? I have 55gal doc filter, lot of plants, 5 - 6" koi and 5 - 4" koi. thanks