oh crap! my cousin was spraying her hairspray and body spray alcoholly stuff downstairs and near my tank... i will make her cough up for this....
only 2 out of my 6 platys died... the rest left in there now are female... so at least no more babies... no other fish have died so far...
however my betta is hiding a lot, has lost some parts of his fins and is very grumpy... but the last bit is how he normally is... i'm not treating for finrot as it isnt that shape of tail missing... it looks quite like it has been snagged actually...
Yeah, you don't want people spraying anything around your tank, not even air freshener. God only knows what is in some of that stuff and fish are really sensitive to some things. Pyrethrins are also in flea powder and animal shampoo. I won't put my hands in the tank after I give my daughter's puppy a bath because the scent of the shampoo is still so permeated into my skin. Even after showering I won't touch the dog and then say feed the fish without washing my hands, but I really don't feed the fish without washing my hands first anyway. Maybe I'm paranoid, but it just seems all too easy to put some tiny amount of some deadly toxin in the tank. The pyrethrin thing freaked me out because of the 2-week time delay.
EDIT: Oh yeah, windex is another fish killer.