Let's be honest, we all make mistakes, including in this hobby. Share your biggest mistakes here so we can all learn not to do what you did!
Let me start...
I was setting up my HOB filter for my quarantine tank, and thought the mechanical filtration sponge was actually the bio filter (ignored the bio ceramic rings), AND thought only a filter floss from my main tank would be enough to seed my QT tank. Unfortunately, I lost 2 African Dwarf Frogs within 36 hours. Fishless cycling for me from now on!
Let me start...
I was setting up my HOB filter for my quarantine tank, and thought the mechanical filtration sponge was actually the bio filter (ignored the bio ceramic rings), AND thought only a filter floss from my main tank would be enough to seed my QT tank. Unfortunately, I lost 2 African Dwarf Frogs within 36 hours. Fishless cycling for me from now on!