Just tested my tank and my ammonia looks like it could be 0.25, nitrites are 0 and nitrates are 40! What the heck has happened? I added two fish on Thursday but didn't think that it could have made an ammonia spike that big
I have done a 50% water change but what else can I do? Thankyou
It was cycled, I got it second hand with everything in, I have just started running an additional filter in it with some filter media from the old one, as I'm going to cycle another tank. Could this be affecting it?
A butterfly pleco is a bit small for a tank that size and I'll bet that beauty is the culprit behind the high nitrates.
You'll likely see a trace of ammonia for a few days to a week after switching filters and it's normal. You can dose prime to the volume of the tank until the bb repopulate.