fluffy algae

This is a farely new tropical aquarium that has been setup for about 3 weeks, the tank itself has been around for about half a year not been used until now and I noticed a white/grey fluff forming on the ornament shown, a little on the other ornaments too. There are no fish or no food that have...

Around Christmas my little sister got a betta, but I pretty much took care of him. About a month ago he got ich, we gave him medicine it sorta cleaned up but there still are spots on him, so we still give him the treatment. A few days ago I noticed ALOT of fluffy algae, so today I cleaned out...