Texas Lake turns blood red

I'm betting there's going to be a lot more bible quoting over this. A few preachers are going to go wild on this.I wasn't aware red tide occurred in fresh water. I first read the headline, I know there's so much red clay around there, I didn't give it a second thought till I saw the picture.
news.yahoo.com...

Already posted.

Was unaware. A search only turned up the Iraq lake story.

Well, here to answer the bible question right off the bat. Is is actually blood? I'm pretty sure in the bible the water turns to blood, not just red water. Btw Im christian.