I've been trying my hand at planted tanks and am a bit confused over the pH changes I'm having.
I have 2.25wpg over 20gallons and keep microrasbora and otos, and 1.89wpg over 29gallons and keep danios and otos.
I have several types of plants and they grow well, some getting pink/red on the tops. They pearl a lot and I must trim once a week.
Everything seems healthy and stable. I've had only one fish death and it was my fault when doing a water change and accidently siphoned out a fish that later died.
I just started keeping readings on the tank with the test kit that measures the pH, ammonia, nitrite and nitrates. This is the API Master test kit.
My tapwater has ph of 8.8 (maybe higher, that's the highest the test kit measures), ammonia between 0 and 0.25, no nitrite or nitrate.
The 20gallon tank has pH of 6 (maybe lower, that's the lowest the test ket measures), ammonia and nitrite 0, nitrate between 10 and 15.
The 29gallon tank has pH of 7.6, ammonia and nitrite 0 and nitrate at 20.
Should I be concerned about the low pH of the smaller tank?
They've both been up and running for about 6 months now. Other than feeding the fish and doing 50% water changes, I've not added anything to either tank since they were set up.
Any advice or suggestions of what to do would be very helpful and thank you in advance.