HOBs create a lot of surface motion that is often hard to control without filling the tank to the rim and restricting the flow somehow. Too much surface motion depletes CO2 faster, and DIY bottles are already inconsistent, so any little thing that aids in CO2 depletion can cause huge swings in plant health, algae etc.I'm new so please excuse the stupid question but why would I not want to use DIY yeast w/ HOB filteration? I am cuz I didn't know better and wondering if it's important enough for me to change? Also, Why Algae blooms w/ DIY yeast and not preasurized? If it's easier, is there a like I can read up on these topics for myself to save you the grief of explaining topics that have probably already been beat to death b4 I joined?