Hello, I am used to regularly getting algae growth (has always been grass green) in my waterers in the summer and I usually need to give them a good clean 1 - 2X a week. I am no longer getting that light green algae, and instead, there is this very dark green algae-looking material that is growing and spreading quickly. Every day after I do a hard scrub and get it off, it's back the next day. I am even finding it in the water bucket I made that didn't even used to get algae. Any idea what this is, and is there something I can do to eradicate it, or at least minimize it? Thanks in advance!