if the fish seem alright at 7.7 then I wouldn't worry about it
maybe check the tank for clacium sources but aside from that you should be
ok with most community species
may not get lots of breeding but from local shops they should be
acclimatised at least.
WHats the ph straight from your tap?



"Jaden" wrote in message
...
Hi Folks,
I'm a newbie to the pastime, so please, bear with me.

Setup:

Jewel 120L tank. (28G?)
Standard Filter. particulate filter cleaned/replaced every week. Others
as per recommended schedule (Activated filter changed once, others
untouched.)
Standard Lights - On for 5-6 hours a day.
2 Inches of gravel, washed and boiled.
Well-ish planted. Some grasses and a couple of Amazon Swords.
6 Inch Airstone, on for ~90 minutes a day.
Temperature - 78f.
Hard water area, pH from tap 7.1 - 7.2

Tank ran for 35 days to cycle it, with no fish.
NH3 - Nil.
NO2 - Nil.
NO3 - 5 ppm.

Tank is not in direct sunlight, but in a south facing room.
I have had 6 Zebra Danios for 3 days, tank is now in day 38.


Issue:

My tank pH seems to settle at about 7.5 - 7.7. I have treated it
previously with a pH down (Aquafin) solution - making it 7.2 or so, but
the next day, it will climb again. I don't think this is the end of the
world, but in the long run I want this to be a community tank, Danios,
Guppies, Tetras and a bottom feeder or two. I have been told that a pH
of in or around 7.0 is desirable for this.

I thought it was the Airstone (I had it on for over 12 Hours a day, but
have dropped it's use considerably).

Any idea why my pH is doing this, or am I just being a Donkey?

Any help at all appreciated.
Rob.