SpotsMama wrote:Whatever you do, I'd recommend scooping out as much of the algae as you can before dealing with it (adding chemicals, letting duckweed or hyacinth cover the surface, for instance). You don't want a huge amount of algae to die and decay in the water because that will make it toxic.
By the way, when the weather's warm, duckweek covers the surface of our pond and it does keep the algae from growing. We scoop out a couple of netfulls of duckweek every day (it grows even faster than algae) to allow some sunlight to reach into the water.
This will sound very not normal of typical turtle care, but, here's how I beat algae:
100% water change once a week, thorough hot water rinsing of tank surface, even where the water didn't touch, hot water rinsing of all tank objects weekly or once a month depending on the size and slime accumulation. I do not keep my tank anywhere near a window.
I know how much bacteria a reptile can build up... I'm determined that every reptile I raise is going to end up totally healthy, happy, and clean, because there are TONS of people in the world who don't seem to get sometimes that reptiles are sensitive to their environment, and their environment feeds their health.
In other words, I never let it build up to begin with. In a tank at least. I like algae for ponds, because I think it's more appropriate.