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i popped out tonight to watch a thunder storm and after about an hour i came back and noticed that one of my fish was hovering in one corner at the bottom as i took a closer look i noticed that it had a wound to its head and at that split moment i was a tiny fry swim really close to him and he ate him up(bugger it) it was a cream coloured fry. anyway i guessed that he damaged his head getting into that gap trying to get to that poor little fry. i put some food in to temp him out and it finally worked..........then i thought i saw something but wasnt sure so i got a magnifying glass and took a deep look at where i saw the fry and to my surprise it was a bright orange little fellow staring out the weeds (another fry) then another one, a yellow one...............then a red one
i continued to watch and noticed the way my other fish was getting into them so i got some spare artifical grass things and added even more to that corner of the tank and now he cant get anywhere near them.
after elimination i realized that they were micky mouse platy fry.
one of my female platties has been slightly bigger than yours for at least two weeks and she had the same uneven swelling as yours, these are the first time that ive had platties so i was unaware that she was pregnant, just fat as all she does is eat at great speed compared to the rest
also got a silver molly thats two weeks pregnant, i know this cause i spent all evening watching them at it

and shes swelling very quickl, i took a good look at her i can see the frys eyes forming inside.
will get a pic uploaded for you to see my FAT platy