PH problems, need help.
I have had my 125 gallon tank running for a few months now. All I have in the tank is Red flint gravel, male guppies, cory's and 4 otto's.
I have had an issue with my PH since day one, I figured it will normally go down on its own as its supposed to. This hasnt happend. My fish have been ok until the last 2 days.
In the last 2 days I lost 1 cory, 8 guppies.
My PH will only register on my High range test. That stops at 8.6 The water I tested was purple, it is above 8.6. I tested my tap waters PH and that is a stabile 7.6.
All I have in the tank is one piece of drift wood that came from my old planted tank, and fake plastic plants.
My results are...
PH High Range... Over 8.6
Nitrate.... 5. which is the lowest my test kit reads.
What could cause my PH to go up this high and stay there. I do my normal water changes etc. I am going to do a large change, ( half the tank).
What else can I do to lower this. I dont wan to to lose all my fish and have my money wasted.
Let me add my other 3 tanks that also use tap water, are doing great, no fish losses ever. Something has to be casuing my pH to sky rocket.