You added two new fish to a system that was possibly unstable. You also
added fish without quarrantining them. Likely the new fish brought some
disease/parasite to the mix and with the change in conditions, the
older fish's immune systems couldn't deal with it. ALWAYS quarrantine
new fish for 4 to 6 weeks, otherwise you're playing Russian Roulette.
Sooner or later you'll get the aquatic bullet.

Start partial changes now, it can't hurt and it will help. Sick fish
need extra clean water. Healthy fish too! The salt is okay, but not
more than 1 level tsp/gallon, especially if you have no way of
measuring the amount in solution. To make sure the salt content does
not creep up, before you do a water change replace any lost to
evaporation BEFORE the water change (of course, temp and dechlorinate
it properly). Add back in the amount you would have taken out. So, if
your 10g tank has a 20% change, that would be 2g, add back in 2 tsp
(disolved prior) to the tank.

Hold off on medicating until you know what you are dealing with.
Shotgun approaches can be harmful to the fish, and your tender
biological bacteria system in that new tank.

Lilly

Milky-G wrote:
I've had 3 small fantails for about 2 years in a small Eclipse tank
(~2
gallons). They've thrived with no problems, but, of course, they
needed more
room. So I started a new 10 gallon for them. Setup, filled, treated,
etc.
and waited for 2 days (I know, I should've waited a week or so). Then
I made
another mistake by adding a black and a calico moore after about a
week. The
original fish were kind of timid and tended to lay near the bottom in
the
back corner (but they've always been kind of timid, so I didn't think
much
of it). The calico moore died after 2 days. The black moore died the
following day. One of my original fish died a few days later. Checked

ammonia and nitrate/nitrite levels.........looks good. The pH is a
little
low, around 6. Added salt as a general tonic. Now the 2 fish are
still
acting a little unusual, and I've noticed a few white spots/bumps
along the
tailfin of one of them. Doesn't look quite like ich (white spots are
less
defined), but could be. I want to start partial water changes and
possibly
treat with Quick Cure, but I'm not sure if it's too early in the
nitrogen
cycle to risk depleting or killing off beneficial bacteria, which
could lead
to more problems. And I still can't figure out why the others died so

quickly and unexpectedly, since ammonia/nitate levels were almost
zero. Any
thoughts or suggestions?

Milky-G