Molly Fish Acting Weird

[BejaVu]

Here it goes.
About a week ago my molly had babys. She is a spotted molly. She was acting fine until she gave birth.
Her tail fin points down so she is in like a half moon position. She has also been known to hide more and also to float with her head up and tail down. So almost straight up and down. Before all this she was very friendly. She would see my and swim to the glass and interact with me. Now she seems me and goes away. I have done water changes at about 25% weekly. Eating has decreased. No one else in the tank seems to be harmed by this.
 
She doesnt look like she she really wants to use her tail fin. I was told maybe TB. This scares me as i know how serious this can be. The tank is pretty new. Only a month.
 
Ive noticed also that she has a weird scale looking thing abover her head like she is wearing a hat.

 

[neutron20]

Could it possibly be on the second session of being pregnant? You know livebearers lay a couple different sessions of eggs from one fertilization. There were times I couldn't even tell my mollies were prego.. so it confused me.. then here comes babies POW!
 
http/www.molly-fish.com/1/post/2013/05/molly-fish-acting-funny-need-answers-quick.html
 
It's really tough with livebearers too because I've had them die on me just out of nowhere when they seemed happy as the world could be... quite depressing. My girlfriend once said, "maybe that's why there only $1.99.." You think it wouldn't matter though.. i dont know where to stand on them living a long life. My record is 2 years on a molly.

 

[eaglesaquarium]

How are things after a 90% water change?

 

[neutron20]

How are things after a 90% water change?

You advise that much of a water change?

 

[eaglesaquarium]

She's never cycled the filter, and hasn't a test kit to confirm the ammonia, nitrite, etc.  So, YES!
 
Large water changes are very, VERY rarely negative.  The key is temp matched and dechlorinated water.  Her tank has been set-up for only a month, so the water in the tank can't be very different from her tap. 
 
 
In "Old Tank Syndrome" I wouldn't suggest that, but this is part of "New Tank Syndrome".

 

[neutron20]

She's never cycled the filter, and hasn't a test kit to confirm the ammonia, nitrite, etc.  So, YES!
 
Large water changes are very, VERY rarely negative.  The key is temp matched and dechlorinated water.  Her tank has been set-up for only a month, so the water in the tank can't be very different from her tap. 
 
 
In "Old Tank Syndrome" I wouldn't suggest that, but this is part of "New Tank Syndrome".

 
Very understandable! That makes sense now. Not to mention Mollies are pretty hardy fish when it comes to water parameters right

 

[eaglesaquarium]

For the most part... yes.  They are very susceptible to disease if kept in soft water, by and large.  The don't need "brackish water" or salt of any kind really, but they do need a good level of minerals in the water (hard water).  They can actually survive the same water as African cichlids very capably... I'd never keep them with African cichlids, of course, because of the other issues, but they prefer that water to say: South American cichlids (discus, in particular).