I would look into making a DIY reactor. I haven't had much luck with hagen ladders. They are about as good as it gets for a passive diffuser, but they can't touch the effectiveness of a good reactor.
Matt
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Member #6 of the Eheim Pimp Club - 2 Eheim 2213 & 2215 w/ surface extractor, LiquidDoser and Auto Feeder.
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