Sickness or Fish Fighting

jonatheber

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I have a fairly new (about two weeks) tank with water that has no ammonia, nitrate, etc. I had a few fish die right after I stocked it, so I watched fairly closely and saw a guppy acting very aggressive (biting at the side of one of the fish). I disposed of that guppy, and added 10 new fish - some guppies, two Mickey Mouse plattys and some neon tetras. Overnight, all the tetras were gone, but the guppies were fine. I suspect the tetras died because they were newly arrived that day at the LFS, and moving them twice in a day probably stressed them out. Two days later, I noticed have a few fish that have an odd appearance to their tails or fins. Two new plattys seem to have chunks missing - 1 from its tail, and another from its top fin, and one of the three painted glass tetras I had since the beginning has some white stuff on its fins and tails. It has also basically been hanging out in one of the corners for most of the day. I have see NO signs of any fish chasing after any other fish. The biggest other fish I have are three Dalmation Mollys, and they basically seem mostly interested in picking at the gravel to eat. The other two painted tetras seem perfectly fine - no white stuff, and they are swimming all over

Do I have another fish picking on the others? Or is the white stuff on the painted glass tetra a sign I have some sort of disease. I posted pictures (including two of the tetra) on this listing.
 

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I have a fairly new (about two weeks) tank with water that has no ammonia, nitrate, etc. I had a few fish die right after I stocked it, so I watched fairly closely and saw a guppy acting very aggressive (biting at the side of one of the fish). I disposed of that guppy, and added 10 new fish - some guppies, two Mickey Mouse plattys and some neon tetras. Overnight, all the tetras were gone, but the guppies were fine. I suspect the tetras died because they were newly arrived that day at the LFS, and moving them twice in a day probably stressed them out. Two days later, I noticed have a few fish that have an odd appearance to their tails or fins. Two new plattys seem to have chunks missing - 1 from its tail, and another from its top fin, and one of the three painted glass tetras I had since the beginning has some white stuff on its fins and tails. It has also basically been hanging out in one of the corners for most of the day. I have see NO signs of any fish chasing after any other fish. The biggest other fish I have are three Dalmation Mollys, and they basically seem mostly interested in picking at the gravel to eat. The other two painted tetras seem perfectly fine - no white stuff, and they are swimming all over

Do I have another fish picking on the others? Or is the white stuff on the painted glass tetra a sign I have some sort of disease. I posted pictures (including two of the tetra) on this listing.
What do you mean you "disposed of the guppy?"
 
Also 2 weeks old isn't very long, are you sure the tank is properly cycled? How big is it? What are your water parameters? I see you have 3 hard water fish (Molly, Guppy, Platy) and then one soft(er) water fish in the Tetra. The "white stuff" could be a variety of things, but I have little to no experience with disease and thus will not comment on it, perhaps @Byron could give some input.
Edit: Sorry if it seems like I was yelling at you, I/we just want the best for your fish and you. Also yea what do you mean by "disposed of the guppy"?
 
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I agree with what Holdenon said/asked. Also mixing mollies with tetras I don’t think can end too well as they can have an aggressive side.

Since the pictures are a little blurry, could you post a video on YouTube so it can be a little more clear? It can be several things.

Also, adding in 10 new fish to a two weeks cycled tank, there will be quite a few dead within a day...
 
Usually there are some nippy fish or aggressive fish especially in crowded and small tank that are less than 2ft long.

Even for bacteria infection to happen, there are usually injury to fins or tail that are caused by other fish.

Some fish are nippy & aggressive.
How big is your Mollies, Guppies, Platies?
Big fish will bully the smaller fish.
 
What happened? People on this forum are as passionate about helping as they are about fish. Don't be shy; how are things going with your tank?
 

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