It's interesting to see a large aquarium store dealing with the same start up issues we hobbyist have. All the tanks in the front part of the store are now going through the cloudy, bacteria bloom, phase. They have a ~120 tall tank that is set up with about 30 different bubble driven ornaments (e.g., treasure chest, shark head, etc). Water was clear Friday, but last night, it looked terrible.
They also have two large tanks set up with a bunch of HOBs, canisters, skimmers, sand beds, etc. It's nice to be able to see them in action before buying one. It's ironic however, to see a tank with > 100x turnover rate with cloudy water. Maybe I'll suggest they add a sponge filter to help clear up the tanks.
The fish room is also having issues with cloudy water and some sick fish. The fish in the African Cichlid, salt water, and gold fish sections seem healthy; but the Central American cichlid section does have some sick fish. Only one large Black Lace angel is left and in bad shape. I'm not sure if they sold the others or they died.
I spoke to John, the fish expert, and he said they were growing bacteria cultures months in advance. I wonder why all the tanks were going through a bacteria bloom then. When I started my last tank, I put seeded sponges in my canister and it cycled in 5 days without experiencing a bacteria bloom.