Great Thread!!
I'll second the engineer gobies!! Digging, sand moving, tunnel building, impossible to remove sob's. Cute, but not that cute. We took them back to lfs. Live and learn.
I'll also second the yellow tang for the same reason as someone mentioned earlier... He is a model citizen, however if I had a choice (I inherited him with my fiancee') I would have picked a different tang and there is not enough room in that tank for another tang. Our plans are to consolidate our three tanks and I hope to persude him to give the YT away at that time. (he's had him for 5 years)
Damsels too, inherited them as well... went straight to the lfs when the tank was transfered to "our" house. They are just flat out mean!
My great lessons...
Cover your tank when you keep a flasher wrasse!!!
Strawberry pseudochromis like to pick on shrimp!!!
Clownfish are "just pretty damsels" that play in an anemone, and they bite you when you get close. (I've learned to live with this one... they are just too awesome)
Too many tangs in a tank is bad news, very bad news.
I'm sure there is more stupidity to share (oops i mean lessons that I've learned), but that's all I can think of right now
