I have all my tanks running on a UPS, mainly because the fuse board in our place is old and often trips, so filters get left off all day until someone comes home and notices! I don't run my lights via the UPS though to conserve battery power, but if the light controller does odd things after a power out, then this of course makes perfect sense.
I would go for a very basic model UPS to basically just give you the battery backup function. The fancier the UPS with the more protection features, then the more likely it is to not like being without a ground connection. The dumber the UPS the better in this case!
The advice I found when recently upgrading my PC UPS was to not use a surge protection device with a UPS - either one or the other. Most decent UPS's have surge protection already, and apparently an addition surge protector in the line can stop both working properly. I didn't understand how or why, but not mixing the two seems to be agreed best practice.
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