We're it mine I would clean out my pre filter and or sponge media with tank water. Also old canisters can accumulate crap so dump out. But don't mess with the bio filter right now. I always clean the canisters in stages. Regardless high nitrates aren't causing as much stress to your fish as huge water changes unless your replacement water is damn perfect--the right ph, treated and warm before you put it in.
I am having a problem cause i did too big of a water change and the water out of my tap swings from 6.4 to 7.8.
I am having a problem cause i did too big of a water change and the water out of my tap swings from 6.4 to 7.8.
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