Lots of options but in terms of flow rate you'd probably want to aim at around 10x turnover, could do a bit less but nice to the have the extra available encase you want to run reactors or end up with some extra losses from extra fittings and dirty pipe down the road. With 10' vertical and 12' horizontal you're looking at 15' minimum head pressure so ultimately you'd want to look at a pump capable of doing 1800GPH @ 15'.
In the reeflo series that's a barracuda or yellowtail. Keep in mind pumps this size will make a decent amount of noise so ensure the sump isn't directly under a bedroom or somewhere the noise would be a nuisance.
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