I hoped I wouldn't be on again so soon on something of this nature 
Looking for help from you guys again please. I do have a hundred questions but will post the non emergency ones in the general discussion forum, or this will lose its focus. I apologise in advance that this'll be wordy. I want to give as much info as I can.
Our emergency
Following the loss of our 2 gold gouramis last week to what was 'diagnosed' as columnaris, we lost a black molly yesterday ( mollies were our original fish with tetras) and I have our other black molly in the hospital tank looking like he's about to go any second ( basing that on the symptoms of the others) He's no longer feeding from this morning.
Also have a dalmation molly sitting most of the day behind a piece of wood. She is swimming some of the time and feeding normally. No superficial symptoms ( tho hard to tell on a dalmation!) only this behaviour. I think she is the mother of my 4 babies and looks pregnant again so my question on her:
is this behaviour 'normal' for pregnant fish? Hiding and resting on the bottom of the tank behind something. Or is she ill as well and should I move her to hosp tank also? I'm frightened to just now in case its just cos I think she's pregnant and if I move her with sick black molly I might end up killing her.
Tank is 180 litres
Stats are:
PH - 7.2 - 7.4
Ammonia - 0
Nitrite - 0
Nitrate - 5
Temp 26 degrees
Water changes (25/30%) and hoovering weekly
Carbon removed from filter to add meds
Cycled and first fish added - end jan 08
Decoration is:
Gravel
2 plants
resin cave
2 rocks
wood with live plant (added last sunday)
airstone
baby nursery
Fish in main aquarium
2 blue gouramis
2 dalmation mollies
5 serpa tetras
2 cory cats
1 otocinclus
4 babby mollies in nursery plastic holder
Hospital tank is 13 litres
Set up yesterday as emergency so added half main tank water with above stats, half new water with conditioner added. All stats same as above.
filter
heater
airstone
2 fake silk plants( for comfort)
Worried that adding half water from main tank, as it was an emergency, in order to provide cycled water would have passed illness to the hosp tank? Main tank stats are fine but is the illness still in the water?
The black molly we now have in the hospital tank was in the top corner this morning completely motionless and we thought he was dead. My husband went to get him out and he moved, then started swimming like he was 'drunk'. Now hiding in the leaves of one of the plants and when I tried to move him there he swam vertically to the bottom and is struggling to balance again.
Moved him to hosp tank yesterday when we noticed he had the clear/whitish string poo like thing coming out of him. Like the columnaris on the gouramis started.
I can't get a pic as he's hiding but there is no real visible sign of anything. The string is gone now and all I can really see thats different is one white spot on his back.
Gills seem to be moving quicker? And the swimming problem.
I started treating main tank with Melafix and Pimafix on Wednesday.
Adding both of these to hospital tank also and just added API Aquarium Salt ( salt added to hosp tank only)
A little knowledge is indeed a dangerous thing and my head is spinning with all these meds. I started treating what I thought was columnaris again, but is this something else, or not something else but symptoms of columnaris?
I read up on columnaris and 99.9% certain thats what gouramis had. But mollies? Read up on white spot and they seem to have had/have the symptoms of that - white spots and more rapid gill movement but not the rubbing themselves against things. BUT the stringy poo isn't a white spot symptom I don't think. As I said, a little knowledge....
with people you don't need to have all symptoms so I guess animals and fish are the same.
The black molly who died yesterday had no signs of anything superficial wrong but was 'hiding' in leaves and sitting in top corner and bottom of tank motionless for long periods.
Also bought anti white spot and myxazin but have not used. Terrified to add too many meds, and end up using the wrong meds or adding something will maybe have an adverse reaction with something else, or harm certain fish but not others as its a community tank.
Is there a general medication for everything when you don't really know whats wrong?
So, my dalmation molly question is above. Is she ill or just behaving 'pregnant'?
My other question(s)
Is, is this still columnaris? I have no clue what meds can mix with what others ( apart from melafix with pimafix) and I don't want to do more harm than good.
Should I increase the temp in both the main and hosp tanks cos I'm using meds?
Should you not feed your fish when using meds?
AND MORE IMPORTANTLY am I using the right meds in pimafix and melafix - and salt in hosp tank- or should I be using something else. What is wrong with my fish.
As I said, I'm probably reading TOO much and sometimes conflicting advice, so my head is spinning.
Sorry if this is garbled. I hope someone can help. Even if you ca answer some of my questions as individuals. I'm grateful.
And aside of this does anyone know an easy to understand, simple fish emergencies/how to identify and treat diseases book? I need to start learning more.
Many many thanks in advance
Fergie
xxx

Looking for help from you guys again please. I do have a hundred questions but will post the non emergency ones in the general discussion forum, or this will lose its focus. I apologise in advance that this'll be wordy. I want to give as much info as I can.
Our emergency
Following the loss of our 2 gold gouramis last week to what was 'diagnosed' as columnaris, we lost a black molly yesterday ( mollies were our original fish with tetras) and I have our other black molly in the hospital tank looking like he's about to go any second ( basing that on the symptoms of the others) He's no longer feeding from this morning.
Also have a dalmation molly sitting most of the day behind a piece of wood. She is swimming some of the time and feeding normally. No superficial symptoms ( tho hard to tell on a dalmation!) only this behaviour. I think she is the mother of my 4 babies and looks pregnant again so my question on her:
is this behaviour 'normal' for pregnant fish? Hiding and resting on the bottom of the tank behind something. Or is she ill as well and should I move her to hosp tank also? I'm frightened to just now in case its just cos I think she's pregnant and if I move her with sick black molly I might end up killing her.
Tank is 180 litres
Stats are:
PH - 7.2 - 7.4
Ammonia - 0
Nitrite - 0
Nitrate - 5
Temp 26 degrees
Water changes (25/30%) and hoovering weekly
Carbon removed from filter to add meds
Cycled and first fish added - end jan 08
Decoration is:
Gravel
2 plants
resin cave
2 rocks
wood with live plant (added last sunday)
airstone
baby nursery
Fish in main aquarium
2 blue gouramis
2 dalmation mollies
5 serpa tetras
2 cory cats
1 otocinclus
4 babby mollies in nursery plastic holder
Hospital tank is 13 litres
Set up yesterday as emergency so added half main tank water with above stats, half new water with conditioner added. All stats same as above.
filter
heater
airstone
2 fake silk plants( for comfort)
Worried that adding half water from main tank, as it was an emergency, in order to provide cycled water would have passed illness to the hosp tank? Main tank stats are fine but is the illness still in the water?
The black molly we now have in the hospital tank was in the top corner this morning completely motionless and we thought he was dead. My husband went to get him out and he moved, then started swimming like he was 'drunk'. Now hiding in the leaves of one of the plants and when I tried to move him there he swam vertically to the bottom and is struggling to balance again.
Moved him to hosp tank yesterday when we noticed he had the clear/whitish string poo like thing coming out of him. Like the columnaris on the gouramis started.
I can't get a pic as he's hiding but there is no real visible sign of anything. The string is gone now and all I can really see thats different is one white spot on his back.
Gills seem to be moving quicker? And the swimming problem.
I started treating main tank with Melafix and Pimafix on Wednesday.
Adding both of these to hospital tank also and just added API Aquarium Salt ( salt added to hosp tank only)
A little knowledge is indeed a dangerous thing and my head is spinning with all these meds. I started treating what I thought was columnaris again, but is this something else, or not something else but symptoms of columnaris?
I read up on columnaris and 99.9% certain thats what gouramis had. But mollies? Read up on white spot and they seem to have had/have the symptoms of that - white spots and more rapid gill movement but not the rubbing themselves against things. BUT the stringy poo isn't a white spot symptom I don't think. As I said, a little knowledge....
with people you don't need to have all symptoms so I guess animals and fish are the same.
The black molly who died yesterday had no signs of anything superficial wrong but was 'hiding' in leaves and sitting in top corner and bottom of tank motionless for long periods.
Also bought anti white spot and myxazin but have not used. Terrified to add too many meds, and end up using the wrong meds or adding something will maybe have an adverse reaction with something else, or harm certain fish but not others as its a community tank.
Is there a general medication for everything when you don't really know whats wrong?
So, my dalmation molly question is above. Is she ill or just behaving 'pregnant'?
My other question(s)
Is, is this still columnaris? I have no clue what meds can mix with what others ( apart from melafix with pimafix) and I don't want to do more harm than good.
Should I increase the temp in both the main and hosp tanks cos I'm using meds?
Should you not feed your fish when using meds?
AND MORE IMPORTANTLY am I using the right meds in pimafix and melafix - and salt in hosp tank- or should I be using something else. What is wrong with my fish.
As I said, I'm probably reading TOO much and sometimes conflicting advice, so my head is spinning.
Sorry if this is garbled. I hope someone can help. Even if you ca answer some of my questions as individuals. I'm grateful.
And aside of this does anyone know an easy to understand, simple fish emergencies/how to identify and treat diseases book? I need to start learning more.
Many many thanks in advance
Fergie
xxx