snide, Its kinda like waiting for water to boil. Go out and take some pictures of your algae and then maybe once a week this summer. When you get your pictures developed, you'll see a big difference. Also when the spawn starts growing, it will go a lot quicker.
When the water is a little warmer, you'll notice them more in the shallows making nesting sites. And they do make big nesting sites. I had a couple last year that were as big as a garbage can lid.
The warmer the water, the more active they are.
