Big aggressive guppy problem, please help!?

Question

It's like chaos has broken out in my tank. My blue female is attacking my yellow pregnant guppy, I isolated her and a sick guppy (not sure what's wrong with her I'll get to that in a sec) together in a fry net to keep them away from the aggressive female but now the yellow female is attacking the sick female inside the net..What is wrong here?! Ontop of which the only female left in the tank with my males is the blue female and they are pestering her.
The sick guppy..I'm not sure what's wrong with her.. Three days ago she starting hanging at the top of the tank in a certain corner and she's refusing to eat. She has two small holes in her tail that aren't getting any bigger. Her color was good for awhile but now she's looking pale. She isn't showing any symptoms of being sick other than refusing to eat and being very inactive. I'm going to isolate her in a hospital tank. What should I do about the other two?

the sick female is now in the hospital tank. I still have the yellow female guppy isolated from the other female..the blue is occupied with the males but comes to the net every so often and pecks at it trying to get to the yellow female..Still not sure what to do..Should I leave the yellow female isolated? She should be giving birth in a week or two anyways.

Answer 1

Many people refuse to believe it, but guppies can be and all too often are aggressive little fish. The only saving grace is that they are too small to do any real damage except to other really small fish like other guppies.

Is your yellow a fairly new fish maybe? Could it be territorial in nature? Quite rare among guppies but it does happen.

The only other thing I can think of is frankly just plain aggressiveness. I recall reading that some colors are more aggressive than others, but can't recall now which were supposed to be the more aggressive. There wasn't any real science behind it yet, just theory so far and I haven't heard of any testing to support the theory to date. Anyway, all that said it's hard to get a zebra to change it's stripes and it's hard to get a fish to change it's personality, I doubt you'll be able to put her with those particular females again without getting the same results.

As for the sick fish. Lose of color and not eating sound like an internal infection to me. Possibly a parasite instead, but more probably a bacterial problem. Her refusal to eat makes attempting to treat the problem very difficult indeed. The holes in her fins can have several causes, but given the situation with the other fish I would call them damage.

MM

Answer 2

step 1 take out the male and put him in a bag or box filled. with water step 2 get a fish treat and place one in the fish tank containing the two females so they start to fight step three . go to a hotel then the highest room step 4. chuck them out the window and watch how many times their life flashes before their eyes before they hit the ground