cycled tank, amonia

[firemedicmackey]

I've had my tank up and running for 6 months. It's a 26 gal. bowfront. Currently I only have a snail and a damsel in it. My test results have been awesome, and today I had a PH and amonia spike.

My temp is 76
Salinity is 1.21
Amonia was .50
PH 8.8
Nitrate 0
Nitrite 0

I did a pwc and haven't rechecked it yet...

Thanks,

Rich

 

[melosu58]

It should be better with the PWC. Either something died or you are adding it with your top off or PWC water. Have you added anything new like Fish, LR or additives.

 

[roka64]

I agree with Mike, check your source water.
Is there a possibility that low of a bioload could not keep the nitrifying bacteria alive? How often/much/what do you feed?

 

[Sadielynn]

I agree with the above what is your water source .Also do you have any corals ? Also try to bump the spg up a bit to 1.024-1.025 ...an easy way to do that is when you top off use your salt water to top off checking it frequently (every top off ) Prime your salt water with an air tube on a pump or a power head this will help stableize it before adding it