Just did a full run of tests on my tank and my ph lev was at 6.0 wich is a bit low. Is this harmfull it normally sits on 7.0 strat from the tape. and has never changed before nitrite is 0 ammonia is 0.25 and nitrate is about 10

Your pH will drop as water quality goes down. Increases in dissolved CO2 can cause the pH to drop too. Water changes and add aeration should help.

thanks

Hi Paul, the fact you have an ammonia and nitrie reading shows signs that you may have a small problem. most common reasons for these readings are
1, just cleaned filter and over cleaned it a little.
2, filter not upto the job and not coping.
3, filter needs cleaning.
4 new tank not fully cycled.
If you are not sure about why you have ammonia,nitries readings and need help please post more details about your set up,tank size,filter,fish stock and size, maintaince program and how you clean. also if you have a large amount of drift wood this will affect your PH

personally i would deal with the ammonia prob first. do a 30% wate change asap and follow that up with 20% water changes every second day. keep testing your water and keep changing the water until your ammonia and nitrites read zero.

as for the ph if it doesnt improve when your water is in check you might try adding some crushed coral into your system to raise the level. however you must get the ammonia problem solved first.

As others have already said, tackling the ammonia issue is your first priority.

As far as the pH, have you ever tried the bucket test on your tap water? Fill a bucket with tap water, stick an airstone in it and let it sit for a day or two with aeration. Test the pH at the beginning of the tets and at the end, to see if it changes. Often, water companies will dissolve a temporary alkali in the water to prolong the life of the pipes (a form of protection from the acidic damage to the pipes). Once the water is no longer under pressure, the alkali dissolves out and he pH drops. This may explain your pH drop.

Ammonia is the real concern at the moment, though, not pH.