A little off topic, but may be useful to those with huge setups like airspirt. I have an aquatic turtle, and the water would always get nasty very quick (turtles are very dirty). This was with a decient filter. None of the water clearing chemicals or alge destroyer chemicals made a difference. In the end I bought a UV sterilizer (I'll post a link tomorrow when I'm at home), and now always have crystal clear water.
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