Ph6.4

[carolandstella]

Hi can someone please help me i have a 180litre tank been running about 2 years without any problem.
my ph in the tank has always been 7.8 ammonia 0 nitrite 0 nitrate 0 for about the last 3 weeks my ph has suddenly gone to 6.4 nothing has been added to the tank at all i have 3 oscars and 1 pacu in there.I do 25% water change every 1 to 2 weeks then add with dechlorinated tap water
I also have 2 other tanks and the ph in them 2 are 7.8 when i do water change on them do the same add dechlorinated tap water Any suggestions would be much appreciated Carol

 

[WILDER]

What your tap nitrate reading and do you have any live plants.
What ornaments and substrate do you have in the tank.
I would post also in the cichlid part of the forum.

 

[carolandstella]

What your tap nitrate reading and do you have any live plants.
What ornaments and substrate do you have in the tank.
I would post also in the cichlid part of the forum.

Thanks for getting backto me
My tap water reads 7.8 no live plants only plastic gravel substrate which gets cleaned when i do the water changes
carol

 

[WILDER]

What your tap nitrate reading as it rare to have a reading of 0.
Never heard of plastic gravel. How long has it been in the tank.
Do you have any bogwood or rock. If rocks which type.
Something in the tank altering your ph.
Do you use C02.

Forgot to ask what test kit you are using.