Okay, so I was looking at my male betta, Serendipity, and I noticed some tiny white strands of what looked like hairs on the aquarium glass. Since I'd just did a partial water change, I thought this was strange, so I started to look closer to see what areas of the aquarium they're in and I noticed that they were moving! They're about as thick as a human hair and almost an inch in length. They're all white and they move like inch worms do (although they're not like any inch worm I've ever seen).
I'm not sure how long they've been there, but I think I'd have noticed if it was longer than a day or so because I do spend some time looking at my fish every day. I did just switch conditioner (to API Betta conditioner), but they're not in Snow Red's (my female) aquarium, so I doubt it's that.
I don't notice any on Serendipity. He does have some white spots on his front fins, but they've been there for ages (I got him over two months ago and they were there then). I've tried treating them with warm, clean, water, with salt water, with bettafix, and with pimafix, but nothing's gotten rid of them (although they do get smaller in warm water, they don't go away). However, he's never had any ill effects from them and this is the first time I've seen these things in the cage so I'm not sure if they'd be related.
It's a twelve gallon aquarium. The water temp's about 82 degrees. I have aquarium decorations (although none new). I have some snails and some glass shrimp in there, but they've all been there for a while (the snails, over a month, the shrimp, several weeks). I have a java fern, but that's been in there for about a month.
So, I have a few questions:
1) What are they?
2) Are they harmful/ what do they do?
3) If they are harmful, how do I get rid of them?