just out of curiosity you say you had 2 platys do you no the sex of the dead one? If it was a female and the other is male it could have just been pestered by the mail to much and these are seperate incidences. You should keep any live bearer to 3 females to 1 male at least but id put maybe four or five

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1 x Bearded Dragon (Billy Bob The Beardie)
1 x Yellow Bellied Terrapin (Michelle Angelo)
1 x 400L Tank Of South American Cichlids
1 x 120L Tank Of Platys
1 x 120L Coldwater 1 x 300L Community
1 x Girlfriend (Naomi)
1 x Ornate Horned Frog (Robert)
Chickens!!!!!!! Wormfarm

That is a possibility but I can guarantee you that toxic levels of ammonia and nitrite will kill them off a lot quicker than any territorial issues.

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If people were meant to pop out of bed, we'd all sleep in toasters...

Member Number 13218
My Menagerie1 x Crossbreed Terrier (F)1 x Dwarf Rabbit (F)1 x Dwarf Hamster (F)1 x Pet Mouse (F)2 x Gerbils (M)1 x Budgie (M)1 x YBS Turtle (M)5 x Tropical Tanks1 x Coldwater Tank

It was a male Platy that died so i have 1 left with 3 females.

ok just a thought.

Do you have ammonia, nitrates, nitrites and PH kits?

Keep a close eye on all of these and do water changes to suit. Make sure you use distilled water or dechlorinator

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1 x Bearded Dragon (Billy Bob The Beardie)
1 x Yellow Bellied Terrapin (Michelle Angelo)
1 x 400L Tank Of South American Cichlids
1 x 120L Tank Of Platys
1 x 120L Coldwater 1 x 300L Community
1 x Girlfriend (Naomi)
1 x Ornate Horned Frog (Robert)
Chickens!!!!!!! Wormfarm

I checked the levels this morning after I saw the fish dead and ammonia was 0. NO3 was 50, so due for a water change which I have done today.
To be honest I have never had any ammonia present so far.

It'll take a few days for the levels to build up but keep testing and doing the water changes as necessary and hopefully, they'll be ok.

__________________
If people were meant to pop out of bed, we'd all sleep in toasters...

Member Number 13218
My Menagerie1 x Crossbreed Terrier (F)1 x Dwarf Rabbit (F)1 x Dwarf Hamster (F)1 x Pet Mouse (F)2 x Gerbils (M)1 x Budgie (M)1 x YBS Turtle (M)5 x Tropical Tanks1 x Coldwater Tank

Sorry I havent read all the posts but the only desease I know of that gives inflamation at the base of the fin is fish tuberculosis.

The Angel is looking much better, infact the redness has completely gone and hes now using it again. But its made me wonder if it was caused by another fish?
Just have to keep an eye on them see how they behave but seems to be happening through the night, cause its the next day when I wake somethings happened. Naughty fish, should be asleep! lol Hopefully a bigger tank will calm them down.

Well thanks for your help everyone, I wont be changing the media again or if i do remember to change part and soak in old water before!

And Happy Halloween! ;-P