As you guys know i just lost my last bubble eye because of the filter, I dont want to lost another goldfish again. What is this red line like blood on my goldfish back? Water param: ammonia 0 nitrite 30 nitrate 33 just did 75 water change and the test still the same. All of the tank i have is fully cycling for about a month except this tank @Deanasue @FallenPepper @Colin_T @Byron please help you guys are my only hope...
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