Strange film on the top of the water

Question
Hi!
I have a 12 gallon freshwater tank with 3 girlie betta fishes.

I use NovAqua products to remove copper, chlorine, etc from water and also a NovAqua product that replenishes skin slime, color, etc. I put 4 drops of each product once a week. (Is this too much or too little?)

I am not sure if the product is doing it or what, but there is a thin film that appears over the top of the water. I use the fish net to skim the water DAILY to remove it, and it is like a slimy..something.

Is this dangerous to the fish? Is it natural? What is it!?

Thanks in advance,
Kayla

Answer
Hi Kayla:  You would have to follow the directions on the bottle to find out if you are adding in too much or too little of the novaqua products.  Do you have well water????  what kind of food are you feeding your fish?  do you have a filter in the tank????   let me know ... dave