Possible Finrot And Assassin Snails

Sue I'm not altogether sure whether my fav Endler has finrot or not. He's a real beauty with a perfectly symetrically shaped and coloured tail with a lovely dark blue stripe running along his body. His dorsal and anal fins are an opalescent colour so if it is finrot it couldnt have been spotted earlier but I just noticed that his anal fin is now looking a bit tatty.

The problem is I dont have a quarantine tank or a spare heaterand filter to put in a bucket and I have assassin snails in the tank. ( I can probably get one at the weekend but I'd rather not leave the little guy that long)

I know because of the snails I shouldn't use eSha 2000 but I do have some Interpet anti-fungal and finrot treatment. I've read the leaflet and can't see anything that would contra indictate using Interpet with snails but I dont want to make a mistake, the assassins have babies now and I'd hate to accidentally kill them off.

Do you have any advice for me please?

I'll be brave and make a suggestion that may also induce shouting!!!! 

Put your snails, or as many as you can save in a bucket or bowl of tank water, with some rocks and greenery and treat the tank. You may have to sacrifice some of the snails but at least your fish will be treated.

I have a 7litre fish bowl with no filter or heater, in which are housed my 2 horned nerite snails and my 2 zebra snails which, after treating my tank with esha 2000 and then seeing that two of them had gone into their shells and shut the door ( literally they have sealed themselves in but they do react still if you poke them - not that im in the habit of poking snails)!! I concluded that esha must kill snails. The other two, and the three adults and however many baby bladder snails i have in there are all doing fine!!!   I give them a bit of lettuce occasionally and sometimes even a bloodworm for who ever finds it first and they are all quite happy!!!!!

As long as you use tank water so they start at the same temperature they are used to and cool down to room temperature slowly, they shouldn't suffer from any shock.

Please feel free to contradict me anyone but I have had my bladder snails living like this for many months and they are fine.

FC76