I "inherited" the tank from my husband, who has had it for years. It's about 30 gallons, freshwater, with super filter. For about a year, we only had one angel fish in it. We bought a "mickey mouse" fish and some other fish of that same family. When we introduced the new fish to our tank, we introduced something else with it.
It started as a small grouping along the back wall of the tank. The angel fish ate them all (whatever they were). Then, they showed up on a leaf of one of the fake plants. We cut off the leaf. A few days later, more showed up on another leaf of the same plant. We threw the whole plant away. Now, they are back on another plant. What are "they?" Tiny little blobs that start out in a clearish-reddish-brown color then turn white. Right now we have a large grouping (probably hundreds of them, but it's hard to tell because they're so small) on a leaf of a fake plant.
Here's a pic-- best I could do
My husband thinks they're snails. I think it's some kind of fungus. Any ideas?