Thanks DC. I figured you'd done something. Heck, you may have talked about it before and I forgot.
A fun option to keep algae at bay would be get a roll of that reed fencing and make it look like a little tiki hut. With all the palm leaves around, you could even do an authentic roof. I did that once to my Great Pyer's dog house, but with a planted green roof...just for fun.
__________________ Caveat: Everything suggested is based on my environment and culture. Please adjust accordingly.