I’m pretty new to everything.. can someone please help me out here.. none of them are really the same or shape as the other.. and they just appeared while I was at work it seems.. at least I’m just now noticing. they are only a white almost purple glowing color. No red or rust color. But I do have red rusty algae or bacteria on my rocks and sand.. I keep reading different things, I’ve been cleaning it off and it keeps coming back. I’ve recently read to just leave it ? this is my first time just leaving it.. I’m not sure if that has cause these things on my glass..