Take him AND some water out of the big tank and put in a small bowl.
Add CS.  Remove water periodically from the small bowl and replace with
water from the big tank.

Marshall

Nicola Kay wrote:

>
>
>      I know some of you out there have experience with aquariums
>      so I am asking for expert advice.
>
>      I have a little fish, not sure what kind but from the looks
>      I would guess him to be a killifish of some sort.
>
>      He is very ill and I really don’t want to lose him.  He has
>      been waning for a couple of days and today he is on the
>      bottom of the tank.  He doesn’t have the strength to swim
>      anymore.  Hasn’t eaten at all for two days.
>
>      There is no sign of sickness on his body and all the other
>      fish are fine.  I cleaned the filters last weekend and did a
>      1/3 tank water change yesterday.  I took him out for a few
>      minutes yesterday and put him into a fish bowl with aeration
>      and clean water but was afraid the drastic change in water
>      quality might put him over the edge so I put him back into
>      the big tank.
>
>      I know I can’t use CS in the big tank but I’m desperate and
>      want to put him back into the fish bowl with water from the
>      big tank which I have medicated with ‘Quick Cure’ which is
>      99.20% formaldehyde and .75% Malachite Green for ick and
>      lymphocystis and added some Ammo Lock. the medication
>      doesn’t seem to be helping and I thought if I put some CS
>      into the fish bowl water that might do the trick.
>
>      I think it is an infection of some kind that’s attacking
>      him.  It seems to be in his head as that’s where he shows
>      the most symptom – the way he moves, etc.
>
>      I’m not concerned about the biological balance because it is
>      a short term treatment and he will go back into the big tank
>      if there’s any sign of improvement before the bacterial
>      balance can hurt him – I hope.
>
>      Any advice or knowledge about this?
>
>      I have to do something tonight as  I’m afraid to let him go
>      through another night without some intervention.  He’s very
>      weak now but still fighting and trying to move around.
>
>      I will greatly appreciate any help that can be given.
>