So I'm planning my ats for my new skimmer less 90g system. This will be a nutrient rich system eventually full of many filter feeding organisms (fan worms, flame scallops, sponges, etc.) I have an allotted space above my sump to allow me to have a 18.5" x 10" screen lit on both sides in a vertical ats. My issue is that going by recent sizing guidelines (12" per cube/day lit both sides or 24" lit one side) it will be a long time before I may need a screen that big. I thought I could start with one side lit and make 2.5"x10" screens (24"/cube/day) and just add another screen each time my feeding schedule increases. should I have an 18.5" spray bar going with only 2.5" of it being used on a screen at first or make a small spray bar and swap it out for a larger one each upgrade? Also I may need a pump that can be ramped up and down, I'd rather not use a bypass valve as it would be wasting electricity and adding unnecessary heat to use an oversized pump. I recently learned it's actually bad to have an oversized ats so it's thrown me a curve ball in my plans. Any advise or suggestions appreciated.