I used to work at Animal Kingdom in Brewster, NY... they would let you make descisions on whether or not to sell on a person-by-person basis. When I quit we had a thriving reef system and could keep discus... when I went back to check on them, they didn't even have any frags... so sad. That's what you get for changing my hours every week!
Right now I work Sundays at a store called PetSmart (used to be a franchise, now each one is independently owned and are not associated), I only take care of the fish, but my manager doesn't know anything about fish, and he orders crazy things and sells to anyone.
But on Sundays, people get quality advice.
"Brian this tank is green."
"Because it is still cycling."
"STILL? But I took the old filter off and put on a brand new one!"
".........."
My manager also put a hippo tang, yellow tang, two percula clowns and a long-tentacled anemone in a 30gal high.
He wondered what was wrong with it and why it crashed, I told him it was doomed from the start.
He brings in everything from the tank to put on the stores systems, and he had ALL of the media in his filter BACKWARDS. As in, the mechanical parts of the cartridges were facing the output, debris and detritus would get clogged in the carbon insert part and decay.
I thought Bio-wheel filters were fairly straightforward.