I added a three stripe damsel to my reef tank because my 6 year old thought it was cute. It quickly became a terror and I had to remove over 100 lbs of carefully stacked live rock to get the thing out.
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I think the most noob thing I have done has to be adding things to the tank I wasn't testing for, calcium , mg, etc. we all tend to learn the hard way sometimes I guess
I would have to say my worst noob moment came after actually a couple years oddly enough. Many tanks ago, I had a 29g mixed reef that was well established, and pretty nice in my opinion. I always liked diy projects and figured I could make a chiller out of an old mini fridge that I wasn't really using anyways. I had maxi jets laying around, so I hooked up some .5in tubing to it and got to drilling the fridge. Put a couple holes in it, ran my lines, siliconed, done, cool. That's where I should have stopped. Granted, up to this point I never had problems with temperatures, I just wanted to see if I could do it and lose the fan that I had blowing on the lights. Got this wild idea a week later that instead of coiled plastic tubing inside the fridge I could use metal tubing instead. Installed new tubing, day later everything was dead except a fish. Worst ah ha moment I've ever had because at that point I realized I used copper tubing to plumb in a reef tank. I felt like such an idiot, like I betrayed my tank....

