Hello, I'm making a 300 gallon rubbermaid tub pond in my front yard(thats the only place I can put it) And it gets full sun all day long, its get the most sun at about 3:00-4:00. I want to keep lilies,water poppy,umbrella palm, and cat tails. Basically all water plants. PLus im going to be running a laguna filter and UV steralizer. I also want to keep a few turtles in there but i wanted to know how i can keep the temp. down in the summer? Im not making it intill the summer but i wanted to know what i can do, so the turtles dont boil lol. do you think they plants will offer enough shade?Thanks.