Here's a tip I learned while living in Florida where its hot and humid. If you have a water fountain and you find it gets that green algae forming due to the heat, add a little of the swimming pool algae cleaner to it. It won't/shouldn't hurt the birds if you just add about a teaspoon or tablespoon of it depending on the size of your fountain. I get the foaming algae cleaner as I like to see it foam up when I add water. The foam disappears shortly. I also add a little to my bird bath too to keep the green slim from forming. I now live up in Iowa but we do have our hot days here too.