Tiny white stuff all over inside glass

I have what seems like thousands of tiny white fuzz looking things growing all over the inside glass of two of my tanks. They seem to move with the current of the water. Is this some kind of algae or something I should be concerned about? I have never seen them in my other tanks but all of a sudden it showed up in two of my tanks.

Not sure what it is but I had that in one of my tanks, I just scrapped it off. Haven't seen it cone back yet about a month ago

it scrapes off easily, they are the only 2 tanks that I don't have plecos in. I might try and get some and see if that helps

I have encountered what seems to be similar to your issue it was from leaving my light on too long and overfeeding a bit my solution was cutting my light off a few days and cutting back on my feeding a bit using my magnetic glass scraper thingy and I haven't seen it since.And as for the mysterious white fuzzy stuff harming your fish not likely just obstructing your viewing pleasure adding a pleco isn't a bad idea either.Staying up on partial water changes,feeding your fish the proper amounts,and providing as close to as possible the proper lighting cycle of your species of fish natural habitat is almost a fool proof "Happy fish Keeping".

Yep my fry tanks get that way from the amount of food and light.

My first thought when I read your post was " Hydra " .
Here is a link for you to read or you can just google "Hydra" and read the other articles .
Ray

http://en.wikipedia.org/wiki/Hydra_(genus)