All is not well in lesser siren land

i noticed yesterday that one of my sirens had white stuff on both its nose and tail tip. this is not fungus-it is the toxin-very sticky and will come off on my hands. i looked around in the tank ferreting out the others to be checked and another one had almost the whole body like this. i removed both -wiped them off a bit-(so their toxins wouldnt pollute the water-and im not sure if it gets in the way of gas exchange) i really didnt know what to do-so i gave them both some batryl for the prescribed 10 mins and popped them back into the group tank. this afternoon the one with the whole body toxin 'out' died. it is my experience that the release of the toxin is one of the last things that happens before a sal dies (tigers it happens alot on their tails only) i have 2 of these guys at the shop at 65 degrees(they are on a top shelf) and they have done fine. the ones here at home are at 76-and 2 of them are like that-well 1 now...i am tempted to take them all over to the shop at keep them in a 55 i have there(i was going to move the current occupants to a 30 anyways).

does anyone know of what i should try to help save the one that only has the nose and tail stressed? i dont know what could have triggered this except sickness-there are no current bites on them and the water quality is great.

...also ...i have a vet appointment tomorrow-so i would like some idea on what to ask the vet for for the one remaining. i also am taking in the new tylos and my new hynobids. the latter are thin but not unsalvagable. john mentions that tylos should be treated for parasites-is this flagyl you are recommending john? (de-wormer??)i am taking along the book on amphibian medicine/husbandry i got last semester-but i believe she does have a copy too. the kweichows are very plump but 3 have head wounds and one has a newly lost tail. the shanjiings look ok but some are thinner than i'd like. with the hyniobids-the blacks are subadults and only one looks in good weight, the tokyos are adults but thin and 2 have newly lost tails.

anyone who has experience with these-esp. ed or some of you european guys -if you have any experience or ideas that would help -please post it-plus ideas to ask my vet one-or medications.

update-the one siren with the tail tip and nose with toxins expressed, she is doing ok-i have her in 1/4 inch of water in a container-she is getting daily batryl then a rise-but-she looks as if she will loose the tail tip. this is the weird part -since i know the tail to be alot longer -i dont know why 'she' is loosing the tip.about an inch from the tip the skin has started to separate like it was actually cut-and it looks as if the flesh and bone will follow, i find this odd since there was no signs at the time of injury. i know it is good it isnt spreading and im guessing like most sals she will grow it back-but it does seem odd.