The Pets At home near me (Chesterfield) run all their tanks on a central filter so as soon as one tank gets a problem all their tanks get a problem, also they don't quarantine or treat the water when they get new fish.
My experience of them=Bad.
Potentially a bad assumption made here. Just because a store runs a Centralised System, it does not mean that Disease in one tank makes them all infected. Anyone running a centralised system that knows what they are doing would run a UV steriliser on their system. (
Rabbut on the side of UV!? the regular posters in the hardware section cry... I'll go into why soon...) If any shop is running a Centralised System, you want to ask what they do for disease prevention. You should hear the words UV mentioned if they are a good dealership. You then want to ask what Wattage of UV they run for how may Gallons, and the flow-rate through their UV, Oh, and when they last changes the tubes. You want a reasonable sounding turn-over through the UV for the gallonage of the system, suffice to say all the filtered water passes the sterilisers before getting into a tank (so about 5-10X an hour). You want about 15W per 100g
The tubes need to be replaced AT LEAST every 6 months for the unit to remain effective.
UV will essentially kill anything disease wise passing the lamps (bar Viruses, but if you get a viral fish disease in your fish room the stock is lost with or without UV anyway) so infections remain localised in one system. The fish are still exposed to diease, in back-ground levels, but the levels remain background, unless there is a disease in the specific tank they are in. On top of stopping disease spread, the UV reduces the risk of Disease outbreak in the first place with the hight levels of stress the fish are under
So, should we all go running out to buy a UV steriliser for our tanks? NO. Would i recommend using one at home DEFINITELY NOT! At home, your fish should not be stressed, and since stress is the main cause of Disease, your fish should not get ill. If you find your fish are constantly getting ill, there is an issue with your husbandry, unless your home tank also happens to be a shop tank or wholesaler tank with high stock turn-over... On top of that, UV will mask poor husbandry, leading to further, harder to solve, underlying health issues in your fish. Also, when the UV develops an issue, you will likely find that all the fishes disease resistance and natural immunity has gone, leading to immediate outbreaks. So, UV in a shop, QT or wholesale tank; good
UV in a home display tank; bad
All the best
Rabbut