Any fish tank/ algae eater ect experts out there?

I recently discovered a pile of some fuzzy spore looking things on the floor of my dad's fish tank. I have no idea what they are and we only have an algae eater in the tank. [fish keep dying. Lord knows wtf has happened. He's been keeping fish for longer than I've been alive and only recently has things gone wonky.]

Pic is a doodle i drew of them. I couldn't get a decent picture because the water is green. :\