-- 3 gallon tank
-- 1 betta and 1 mystery snail (mystery snail has been removed for 3 days)
-- heated to 80 degrees
-- 100% water change every 3 days. I rinse all tank contents(heater, decor, gravel, tank walls) with hot tap water before refilling with conditioned and aged water and I also match the water temperature to original temp. before adding the betta back in.
-- water params are always perfectly spot on
1. For he past 2 weeks I have noticed a film on the water surface of my betta's tank. On water change day (every 3 days) the film starts to separate into spots. 3 days ago, I removed the snail that has been living with the betta since dec. 9th -- I am still getting the film after removing the snail and thoroughly rinsing all contents of the tank.
2. Over the past 2 weeks as well, the betta's fins have been deteriorating. At first I thought he was tail biting but since he also has pinholes and separation in the fins I'm not sure.
I don't understand how this is happening because I keep my betta's tanks very, very clean. I have another betta in the same conditions with the exceptions of different gravel and never having a snail, and his water is always clear and he is doing fine..
I added aqua culture's natural gravel I got from Wal-Mart the same time I added the snail.
I took a VERY long time for the water to run clear when rinsing the gravel for the first time...
Here is a picture, you can see the film and his fins..
and here is what he looked like before...