When you said "save money on my bill" im assuming you mean Electricity Bill? TBH the electricity required to filter all those tanks would be a fraction of the cost of lighting and/or heating them. Id run the 125g's off of one sump, youd need a 55g tank for that and then just run a large HOB or a smallish canisters for each of the 40g's, eheim 2215's would be my choice.