One of the big advantages of a DI system is that is produces fairly consistent results which means you have a solid, year-round baseline to work from when it comes to the water you put in your tank.
Sometimes moving even a few blocks across town can give you different water and blam! algae bloom.
It removes one level of mystery in the hobby. I'd recommend you make the (relatively small) investment and get the filter.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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