Planning on doing (multiple) planted 40 gallon breeder tanks. Seen lots of threads along the same vein, but some of them say different things. A canister plus a powerhead is better than a single hob, obviously. But would two hobs work? With the 2217 would I still need to get a powerhead? Does it depend on how high tech I plan on going? I do want high lighting, so I'll have to dose with ferts and do something about co2 (thought Excel might be enough, "probably not" says reddit). Right now I plan on using Fluorite for substrate. Just trying to pin down specifics before I start my purchases.