So I woke up this morning and there were 2 different growths in my 10 gallon that weren't there the night before.
The first one was a white, hairy stringy looking algae. It looked slimey too. Then the second kind was brown and it was on the glass and plants. It wiped right off though.
The tank gets 8 hours of light a day, and I do weekly water changes of 15%. I would test the water but I gave my brother my testing kit since he's cycling his new tank.
It has 1 betta, fake plastic plants, 2 plastic decorations, rocks, and play sand.
I took Chance out of the tank and set up my old 2 gallon for him until I get it straightened out, and I did a large water change.