Greetings. Can low ph levels harm the beneficial bacteria? I have ammonia readings of .25ppm two days after 50% water change. This has been going on for 2 weeks. Here's what is in my tank:
20 gal long
Aquaclear 50
Temp 78 degrees
O nitrites, 0 nitrates
4 pygmy cories, 7 ember tetras, 3 green neons
2giant java ferns, 1 large amazon sword, 7 anacharis stalks, 2 wendtii, some moss
Gravel substrate
Any suggestions?