what when u guys get new fish u put them in quarintine? I don't i float the bag for 30 mins and then release into main tank
This is just my opinion, but quarantining can prevent something in the neighborhood of 75% of all diseases that show up in your tanks. I think that about 23 of the last 25% can be prevented by doing full treatments. That it is only something like 1-2% of diseases that would have happened without an adequate quarantine, or something that come in with the water or air.
The simple truth is that most fish disease do not some in with the tap water. The overwhelming majority of fish diseases are obligate fish parasites -- that is, they
have to have fish to parasitize on or they die. Ich is the best example. If the free-swimming form of ich doesn't find a fish to latch on to in 12-36 hours (depending largely on the water temperature) it will die. And, the water companies do not have fish living in their treatment facilities. No fish means that no fish parasites/disease are coming in from the tap.
The diseases get introduced from new fish in the vast, vast majority of the time. I understand the desire to see your new fish in the show tank as soon as possible. You want to see if they get along with their new tankmates, you want to see them playing in your decorations, you want to see them integrate themselves into the shoal, etc. But, the absolute best thing you can do for your show tank is be patient and quarantine that fish for 3 to 6 weeks to see if any problems occur. That way you treat the small quarantine tank and stress out only the new fish instead of treating the entire tank and all the original fish. And, in the worst case scenario with a particularly resistant infection, you only lose the new fish and not an entire tank.
And, I don't buy the "no room to quarantine" excuse. You don't have to have an elaborate quarantine tank set up. A cheap plastic tub will do. It doesn't even need to be filtered -- you can change the water on it every day. Or, you keep a small sponge filter running in the corner of the main tank and put it in the tub when you need a Q-tank. And, you do have a spare heater around already, don't you? If not, you probably should because it is only a question of when your current heater will break, not if, and you may not have the time or ability to run out to the pet store to get a new heater at the moment the 1st one broke. And that's it. A Q-tank doesn't need a substrate, doesn't need decorations, doesn't need much at all. The only excuse is impatience and laziness or maybe you are just a risk taker. I just think that if you do that take risk, don't come back asking questions like "where o where could this ich have come from? It must be a dormant strain that my rotten water company released into my drinking water" because there is zero scientific evidence for ich dormancy -- ich is not in "all water" as is commonly belived -- and it was probably because you either didn't kill off all the ich from a previous infection or one of your new fish brought it in as a carrier, something that would have been caught had you performed a nice long quarantine period.
shame theres no MA in sheffield...business oportunity if anyone from sheffield who is old enough to open a shop is reading 
