Originally Posted by Xaltd1
I added 9 at once- once. I lost 3. Ouch. I'm adding 3 as I type... I QT'd them this time. We shall see what happens this w/e.
That's why I am of the opinion to not add so many at once. Of my original 9, I'm pretty sure that three of them stressed out and fell prey to opportunistic infections. Another also got sick and got so weak she became trapped on the filter intake. She will never be able to rejoin because her lip was damaged, but she's recovered and is doing fine in a small tank by herself.
I'm thinking adding that many at once changed the water parameters too much, and while the tank itself is perfectly capable of handling that many fish, fast changing water parameters can stress healthy fish and kill less healthy ones.