I'd say one MP10 and a nano. Two MP10s might... no, will... be a little overkill for the size and the livestock (and cost!).
What type of overflow set up do you have? If you have durso or any other type of siphon overflow you can do a lot more than 100 to 200 gph. I use 1" pipes on my beananimal overflow and it easily does 600 gph and realistically I could hit 1000+ gph without issue. Those 1" pipes can handle quite a bit under siphon.
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