I wouldn't really mind having another seperate frag tank... I should run one like that into my laundry/storage room right behind the wall! Wonder how that would work out... it would have to be between water heaters and the furnace though, and kind of in a weird spot... but it would be nice to have a 30g frag tank or something in there...
Do you just pump water from 1 tank to the other? Then use a stronger return pump? Or you could use the same pump and put it in the other tank, return that water to the sump right where it came out of in the first place... That would work, wouldn't it?