I just need to vent a bit. I’ve never felt more alone and not knowing what to do in this hobby than right now. I bought some guppies who developed fin rot and then it spread to my rummies. I did not have a quarantine tank (which I now regret). I bought one and tried to kickstart it but I lost all of the rummies and 1 guppy. The other 2 don’t look like they are going to make it. Should they die, should I completely empty and clean the 20 gallon QT and then seed it so it is ready for my new purchases? I’m baffled on why they got fin rot in the first place. All water parameters were good, it overfed. I’ve really lost my confidence here. Thanks for listening.