My 5 cents
An MP40 is a lot of pump for a 50g
I use 2 x MP10s in my 75g, with no other pumps besides my return
I've heard others' MP10s and MP40s and decided the 10s were for me as the 40s are too loud for my liking, even listening to the ones in the LFS that were both new and older
Maybe a pair of 10s would better suit your needs if you went wireless
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