So I recently got engaged and with that it looks like I will be moving out of my apartment sooner then I thought. We need to move closer to both our jobs. Right now i am in an apartment that has too many tanks and are heavily stocked. We plan on moving to a significantly large place and I will have a fishroom again. This means I can go back to my old ways of a lot of light to moderately stocked tanks. I have six tanks now and I am paying a decent energy bill and this will most likely only go up. I don't plan on moving to late summer but wanted to start getting some plans and already started putting money away for the upgrades. So my questions revolve around sponge filters. I imagine it would be cheaper to get a blower and run most tanks on sponges instead of the ACs and canisters I am using now. The tanks will mostly range from 40g upwards to some large tanks such as 125 - 150 (yes I am aware this may not be large to many people here). Can I filter most of these tanks with sponges effectively? How do you determine how many or big of sponges yo need? A fair amount of my tanks will be pleco species tanks that need current, so I would be adding hydor type powerheads. Or does it make sense to just use canisters/ACs on these tanks to get the flow anyway? The only thing that gets tricky is that this move will most likely only before a year until we figure out exactly what town we wanted to reside in. Thanks for the input