There is a thin cloudy film on my water. It's a 10 gallon divided in two. There are currently a male and female betta on each side. I bleached & soaked my tank & all the décor in there three times but it came back. My fish are acting normally and don't seem to be affected. One male even blew a nest. I have well water that's a bit hard. I've tried 3 different conditioners to soften it to no avail. I'm placing them in separate jars with water from a different source today. Any ideas on what this is?