Will the 6025 and the 6045 eventually be made to run with controllers?

No. Controllable pumps have to have specially designed motors that are termed asynchronous or electronic. They run on a pattern independent of the 60Hz frequency.
 
Can the 7200/2 be used as a sump return pump? I'm thinking of how a wave action (from 7091) could nice on a return pump through a bulkhead across the surface of the display tank or even through a sea-swirl, maybe wavySea?
 
Yes, but it doesn't have a high head capability, the 7400/2 can handle about 6ft and only does about 500gph at 6ft. I don't think it would be very effective.
 
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