I am actually putting the following info up as reinforcment to all of us new guys that dont think a QT is necessary.
As of reciently I brought my 2 false perc's back to my LFS... I was able to capture these guys because I wanted to rearrange my LR in my tank so I had to empty it all out. Catching these guys wasnt easy but I did it.. I traded them in for a pair of true perc's with awesome colors. I introduced them to my tank with no issues and they seemed to be happy.
1 week later.. white spots on one.. 1 day after that white spots on both..
I thought NOO How can this happen to me.. So not knowing if this was sand or not on them, because my Gramma constantly gets small particles of what looks like ICH on her but in a day it is gone and she hides out in the LR all the time. I figured I would see if this manifested into something bad. Well it did.. in a matter of days both the percs were covered in white spots.
. Immediately I broke down my daughters 10 gal tank that was holding a betta fish. Cleaned it out washed everything off in hot water.. and filled it up with 7 gallons of my cube tank water.. already cycled I can immediately start hypo and treatment. I used the small filter I had on there for the fresh water tank but I cleaned that all out and took some LR Rubble out of my rear chamber and am using that for my biological filtration on the 10 gals filter.
Here is the bad part.. I have 2 other fish in that tank both are not obtainable.. one is a purple fire fish and the other is the Royal Gramma.. Unfortunatly they cannot be coaxed out of the LR for capture... I baited the 2 percs.. they were as easy as pie.. I put food in the net and they basically swam into the net themselves.. these other 2 are not that bold.. So my choice is made for me.. I either have to tear down my tank and get these 2 out.. or let nature take its course.. I am at an impass here but knowledge is power IMO even if its bad.. From here on out my advise is always QT your fish no matter what.. I have one more thing to try.. if I can sort of starve these guys for a couple of days maybe they will be forced to come out and take the food out of the net, not sure though.