Dalmatian Molly Refuses Food

attibones

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Hello. I have decided to join this forum a few moments ago, as I'm seeking assistance with one of my mollies. I have a ten gallon aquarium with one gold mickey mouse platy (male, I believe), two albino cory catfish (one rather small, the other about two inches long), and two dalmatian mollies (both female, one lyretail). I do a ten percent water change weekly, using stress coat (or something. It's by API) which also conditions my water. Just before I purchased the small catfish and my anorexic molly, I had my water tested. Unfortunately, I'm out of test strips, so I can not list the exact parameters. However, my ammonia, nitrate, and nitrite were all at the minimum. Chlorine and pH were fine. My water was in between soft and hard, I think.
 
I don't believe my issue has anything to do with the quality of the water, though, seeing as one molly, the platy, and both of the catfish (as well as my fifteen or so ghost shrimp) are active and eating well. It is the new molly who is lethargic and very skinny. I purchased her and the small catfish two days ago. When I got her, I noticed she looked a little thin, but I thought perhaps this was just from being in a stressed tank. I floated her and the catfish for about thirty minutes, poured the water from the bag into my critter keeper, added some tank water, and then introduced the new fish into the tank after letting them adjust to my water.
 
Now it has been forty-eight hours, and I'm rather concerned about her. The new catfish is playful and enjoying his new home. He has gotten used to his tank mates and eats well enough. The original molly does not acknowledge the new molly, and continues to chase the platy. The new molly rests at a low level in the tank, about one-third from my substrate, and is very still. Yesterday I saw a few of my shrimp eating off her tail, which would have been the culprit for her lethargy if it were not for the fact that she was acting like this as soon as I introduced her. Sometimes she goes to the very top of the water and floats there for a while. She's very slow in her movements and keeps her fins close to her body, but not quite clamped. She's as long as my established molly at close to three inches, but her body looks emaciated. 
 
Is there anything I can do to get her to eat? Should I just give up on her and return her to the store alive? Or, and I hesitate to do this, should I kill her, as I'm worried she won't last the week without any assistance on my part?
 
10 gallon is too small for Molly. She may be still adjusting to the tank. There maybe something killing her. There may be something bad in the water. She may being bullied by other fish. She may have just been a sick fish to begin with.

What I'm really concerned about is this catfish, what species is it? Unless it is a Corydora there is a 90% chance that it will outgrow your tank. Please post a pic so we can identify the species.

Never pour the water from the bag into the tank. This could spread parasites or cause ph swings.

Put the Molly into a hospital tank or put her in a breeder net or put a divider in the tank.
 
Catfish are corydoras. I don't add bag water to the tank. I add tank water to the bag water and then scoop the fish out for transfer. That water is nasty. The new molly has not been bullied (aside from the shrimp incident) in this tank, but she was pretty sickly looking when I got her, but I didn't notice until after I got home. I really just need to know how to get her to eat. I just dropped their flakes, which have always worked for me, and the new Molly isn't interested. She took a small flake into her mouth just now and spat it out. I've tried brine shrimp, daphnea, bloodworms, everything I have on hand. I have not get tried frozen peas, but that will be my next try. How do I get her to eat?
 
attibones said:
Catfish are corydoras.
Not neccassarily. Corydoras are catfish but not all catfish are corydoras. Corydoras can't grow more than 8 cm. but other catfish I think there is only 1-2 out of 3000 species of catfish that stay under 8 cm. I'm really not much help with fish not eating as almost all my fish eat like pigs. However the 1 fish that wasn't eating turned out to be eating the moss I had in the tank before I rehomed him. It would be a good idea to separate the Molly so that she scan actually get to the food before the other fish do.
 

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